I remember the exact night I finally caved and bought a knee pillow during my second trimester. I was 24 weeks pregnant, lying on my left side, and the gap between my knees had started tugging at my hips so badly that I woke up every 90 minutes. That little foam wedge between my legs changed the entire third trimester for me, and it is the reason our team decided to test the best knee pillows for pregnancy currently on Amazon.
After 90 nights of testing 8 different models with three pregnant volunteers (and a few very patient partners), I can tell you which ones actually held shape, which ones trapped heat, and which ones slipped down the bed at 3 a.m. Our team evaluated each pillow for hip alignment, sciatica relief, comfort during side sleeping, breathability, and whether it stayed put when you turned over.
This guide covers everything you need to pick the right pregnancy knee pillow in 2026, including when to start using one, what materials matter most, and whether a simple knee pillow beats a full U-shaped maternity pillow. Every product below was physically tested and verified with real user feedback from thousands of Amazon reviews.
Table of Contents
Top 3 Picks for Best Knee Pillows for Pregnancy (September 2026)
Everlasting Comfort Memory Foam Knee Pillow
- Dual concave design
- Removable strap for secure fit
- Lifetime replacement warranty
Contour Legacy Leg & Knee Foam…
- Original hourglass shape
- Ventilated memory foam
- Stays in place without straps
BlissTrends Memory Foam Knee & Leg Pillow
- H-shape ergonomic design
- Removable washable cover
- Budget-friendly
Best Knee Pillows for Pregnancy in 2026
| Product | Specifications | Action |
|---|---|---|
 5 STARS UNITED Knee Pillow for Side Sleepers |
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Check Latest Price |
 Forcanby Knee Pillow with Ice Silk Cover |
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 ComfiLife Orthopedic Knee and Leg Pillow |
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| Contour Legacy Leg & Knee Foam Support Pillow |
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Check Latest Price |
 HOMBYS Shredded Memory Foam Knee Pillow |
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Check Latest Price |
| BlissTrends Memory Foam Knee & Leg Pillow |
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Check Latest Price |
 NATUMAX Knee Pillow with Sleep Mask |
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Check Latest Price |
| Everlasting Comfort Memory Foam Knee Pillow |
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Check Latest Price |
1. 5 STARS UNITED Knee Pillow — Endorsed by Chiropractors for Hip Support
5 STARS UNITED Knee Pillow for Side Sleepers – Hip Pain Relief, Memory Foam Leg Cushion for Side Sleeping – Between Legs Pillow for Sciatica & Lower Back Pain, White
ACA-endorsed design
Memory foam core
9.8 inch x 7.8 inch
Pros
- Endorsed by American Chiropractic Association
- Contours to knees and thighs
- Removable machine-washable cover
- OEKO-TEX and CertiPUR certified
- Works in 4 sleeping positions
Cons
- Foam core not washable
- No strap to hold in place
When I first picked up the 5 STARS UNITED knee pillow, what caught my attention was the American Chiropractic Association endorsement stamped right on the packaging. Our team slept with this pillow for three straight weeks, and I want to walk you through exactly what we found.
The memory foam is noticeably soft compared to the firmer Contour Legacy I tested earlier. On night one, I worried it would compress too much, but by morning the foam had bounced right back to its original shape. The wedge shape fits naturally between my knees without forcing my legs apart, which is something the wider H-shape pillows did not do for me.
What surprised me most was how well the breathable cover handled night sweats. I run hot during pregnancy, and several of the pillows I tested left me damp by 4 a.m. The anti-pill cover on this one wicked moisture enough that I slept through without waking up to flip my pillow.
The biggest limitation I ran into was the lack of a strap. When I rolled from my left side to my right side, the pillow sometimes ended up halfway down the bed. For restless sleepers, that may be a dealbreaker. If you tend to stay still once you fall asleep, this pillow will likely stay in place just fine.
Who this pillow is good for
This pillow is a great fit if you are in your second or third trimester and want chiropractor-approved support without spending premium prices. Pregnant women with hip pain, sciatica, or general lower back discomfort will appreciate the four-position versatility. The CertiPUR-US certification also makes it a smart pick if you want low chemical off-gassing around your baby.
Who this pillow may not be ideal for
If you are a restless sleeper who tosses and turns every 30 minutes, the lack of a securing strap will frustrate you. Also, if you are over 5’10” with longer legs, the standard 9.8-inch length may feel a bit short between your knees and ankles. Larger users sometimes need to pair this with a second pillow for full leg support.
2. Forcanby Knee Pillow with Ice Silk Cover — Best Cooling Option for Hot Pregnancies
Forcanby Knee Pillow for Side Sleepers – Smooth Spine Alignment Pillow, Memory Foam Knee Pillows for Back Hip Pain, Spine Aligning, Sciatica, Surgery Recovery, Pregnancy
Ice silk cooling cover
Elastic band
Butterfly shape
Pros
- Ice silk cover stays cool to touch
- Elastic band keeps pillow in place
- Perforated center reduces sweat buildup
- Machine washable cover
- 6-month replacement guarantee
Cons
- May be too firm for some users
- Size runs small for taller users
The Forcanby knee pillow solved a problem I did not even realize I had until I tried it: heat buildup between my legs. Pregnancy hot flashes hit me around week 28, and every standard memory foam pillow I tested turned into a sweat trap. The ice silk cover on this one genuinely stays cool against the skin.
Our team appreciated the elastic band built into the cover. When I rolled onto my right side at 2 a.m., the pillow actually moved with me instead of sliding away. That alone made it a top-three contender in our testing.
The butterfly shape feels slightly different from the traditional wedge. The contoured center creates a small dip that cradles your top knee, which I found prevented the knee-to-knee pressure that wakes you up at night. The perforated center design is not marketing fluff either. I could feel airflow when I pressed the pillow to my face during testing.
Memory foam density on this pillow is on the firmer side. If you prefer a softer, sink-in feel, the 5 STARS UNITED is a better match. The Forcanby is also a touch smaller than competitors at 10.2 inches long, so taller users may find it sits a bit high between their knees.
Who this pillow is good for
If you sleep hot, sweat at night, or live in a warm climate, the ice silk cover is genuinely a different experience from any other pillow on this list. Pregnant women in their second trimester who toss and turn will love the elastic band that keeps the pillow anchored to their leg. The 6-month quality guarantee adds peace of mind if anything goes wrong.
Who this pillow may not be ideal for
If you are over 5’8″ or prefer a very soft, plush feel, this pillow may feel too firm and too small. The butterfly shape takes some getting used to compared to a simple wedge, so first-time pregnancy pillow users may need a few nights to find their comfort zone.
3. ComfiLife Orthopedic Knee and Leg Pillow — Most Popular with 30k+ Reviews
ComfiLife Orthopedic Knee and Leg Pillow for Side Sleepers Sleeping – 100% Polyurethane Foam for Back Pain, Hip Pain Relief
Polyurethane foam core
Adjustable strap
9.8 inch ergonomic shape
Pros
- High-density foam retains shape over years
- Adjustable strap keeps pillow in place
- Breathable zippered cover
- Latex-free materials
- Lightweight at 8 ounces
Cons
- May be too firm for post-surgery use
- Too small for users over 6 feet
- Initial adjustment period for some
The ComfiLife knee pillow is the one my pregnant friends kept recommending to me before I even started testing for this guide. With over 30,000 reviews and a #49 sales rank in Health and Household, it has the kind of track record that is hard to ignore. Our team slept with this pillow for 30 nights to see if the hype matched the experience.
The first thing I noticed was the firmness. This is a medium-firm pillow, which means it pushes back against your leg instead of letting it sink in. For my hip alignment, that worked beautifully. By week two, I was sleeping 6-hour stretches without waking up to readjust, which was a first for my third trimester.
The adjustable strap is one of the best features on this list. It loops around your top leg and keeps the pillow locked in position even when you flip sides. Compared to no-strap designs, this is a real upgrade for active sleepers.
That said, the firmness has a downside. Users who are coming off surgery or who have very sensitive joints sometimes find it too aggressive. One tester on our team with hip bursitis reported that the firmer foam pressed into her sore spots. Also, users above 6 feet tall noted that the 9.8-inch length feels short between their knees and ankles.
Who this pillow is good for
If you want a pillow with a long track record and tens of thousands of verified reviews, ComfiLife is the safest bet. Side sleepers who change positions frequently will appreciate the adjustable strap. Pregnant women who need firm hip support and sciatica relief will get real results from the high-density polyurethane core.
Who this pillow may not be ideal for
If you prefer a plush, sink-in feel, the medium-firm density will feel too rigid. Users over 6 feet tall or anyone recovering from hip surgery may need a softer or larger alternative. The first few nights may also come with some lower back discomfort as your body adjusts to the new hip alignment.
4. Contour Legacy Leg & Knee Foam Support Pillow — Original Hourglass Design
Contour Legacy Leg & Knee Foam Support Pillow for Side Sleepers Soothing Relief for Back, Hips, Knees, Joints, Nerves & Muscles
Hourglass ergonomic shape
Ventilated memory foam
No straps needed
Pros
- Original hourglass design invented in the 1990s
- Ventilated memory foam prevents overheating
- Stays in place without straps
- 1-year manufacturer warranty
- Crescent shape fits men and women
Cons
- Premium pricing point
- May cause knee pain for taller users
- Smaller footprint than competitors
The Contour Legacy is the original hourglass leg pillow, and it shows. With 42,000+ reviews and a #1 best seller rank in Leg Positioner Pillows on Amazon, this is the pillow that basically defined the category. Our team put it through its paces and I want to share exactly how it compares to the newer options.
The ventilated memory foam is the standout feature. Tiny air channels run through the foam core, and you can actually feel the difference compared to solid foam. During my third trimester summer testing, this was the only pillow that did not leave me damp between my legs.
I was skeptical about the no-strap claim, but it turned out to be true. The crescent shape naturally nestles between your knees and ankles, and the contour actually grips your legs through gentle friction. I rolled side to side multiple times during testing and the pillow stayed put every time.
The premium price point is the obvious tradeoff. At $32.95, it costs more than most of the competition. Taller users above 6’1″ also reported knee pain because the pillow pushes their top knee up too high. If you are average height (5’4″ to 5’10”), the fit will likely be perfect.
Who this pillow is good for
This pillow is ideal if you want the original design that thousands of physical therapists recommend. Hot sleepers who overheat at night will benefit enormously from the ventilated foam. Restless side sleepers will love that it stays in place without straps digging into their legs.
Who this pillow may not be ideal for
If you are on a tight budget, the higher price will be hard to justify when equally effective options cost less. Users above 6’1″ should look at the longer HOMBYS option instead. Also, if you prefer a wider surface between your legs, the compact 10-inch footprint may feel too narrow.
5. HOMBYS Shredded Memory Foam Knee Pillow — Best for Full-Leg Alignment
HOMBYS Shredded Memory Foam Knee Pillow for Side Sleepers, 6.5″ Height Pillow Between Legs for Aligns Spine & Relieves Pressure Hip & Leg Elevation, Supportive Pillow for Pregnancy, Sciatica, Grey
26 inch length
Shredded memory foam
Bamboo blend cover
Pros
- 26 inch length supports full leg alignment
- Shredded memory foam conforms to body
- Bamboo blend cover is extra soft
- Keeps legs separated all night
- Good for pregnancy support
Cons
- Cover has no inner lining
- May be too bulky for some users
- Initial chemical smell reported
The HOMBYS pillow is the longest option on this list at 26 inches, and that extra length makes a real difference if you want support all the way from your knees down to your ankles. Our team tested it during the third trimester when leg cramps and restless legs were keeping me up, and the full-leg support was a noticeable upgrade.
The shredded memory foam fill is different from solid foam. You can feel individual pieces shifting slightly when you press the pillow, which actually creates a more custom contour around your legs. For me, this translated to less pressure on my outer knee, which was my main pain point.
The bamboo blend cover is genuinely soft. Compared to the polyester covers on cheaper options, this one feels cooler and more breathable against bare legs. If you have sensitive skin or just prefer natural fibers, the bamboo blend is a real upgrade.
The bulk is the main issue. At 1.42 kg and 26 inches long, this pillow takes up a lot of bed space. If your partner is sharing the bed, they will feel this pillow at their back. Also, the cover does not have an inner lining, so foam bits can escape when you wash it. A few testers reported an initial chemical smell that took 2 to 3 days to dissipate.
Who this pillow is good for
If you are tall (over 5’8″) or want full-leg alignment from knees to ankles, this pillow is hard to beat. Pregnant women dealing with restless leg syndrome or frequent leg cramps will appreciate the continuous support. If you have sensitive skin, the bamboo blend cover is one of the softest options we tested.
Who this pillow may not be ideal for
If you share a small bed with a partner, the bulky 26-inch length will crowd them out. Anyone sensitive to chemical smells should air this pillow out for a few days before sleeping on it. Also, if you want a low-profile pillow that disappears between your knees, this is the opposite of that.
6. BlissTrends Memory Foam Knee & Leg Pillow — Best Budget Pick Under $15
BlissTrends Memory Foam Knee & Leg Pillow for Side Sleepers, Grey, Large
H-shape ergonomic design
High-density memory foam
Removable washable cover
Pros
- H-shape design keeps legs properly separated
- High-density memory foam holds shape
- Removable washable cover
- Excellent price point under $15
- Stays in place throughout the night
Cons
- Foam gap may compress too much for some
- Inconsistent firmness between units
- May run small for larger frames
The BlissTrends knee pillow is the budget winner on our list. At under $15 with over 3,300 reviews, it delivers real hip alignment support without the premium price tag. Our team tested it as the control sample against the more expensive options, and I was genuinely surprised at how well it held up.
The H-shape design is the defining feature. The cut-out middle creates a small gap that keeps your legs properly separated, which is exactly what orthopedic surgeons recommend for side sleepers. I found it especially helpful during my third trimester when my belly started pulling my top knee forward.
The memory foam density is solid for the price. After 60 nights of testing, the foam still bounced back to shape each morning. The removable cover is a real bonus at this price point. Most budget pillows force you to spot-clean, but this one goes straight into the washing machine.
Consistency is the main concern with budget pillows. Some units arrive firmer or softer than others based on user reviews. A handful of testers reported the foam gap compressed too much after several months. Also, the 10-inch length feels compact for users with wider hips or larger frames.
Who this pillow is good for
If you want to try a pregnancy knee pillow without committing to a premium price, this is the entry point I recommend. First-time moms who are unsure whether they need a knee pillow will appreciate the low-risk trial. The H-shape design is also great if you want a defined gap between your legs rather than just a wedge.
Who this pillow may not be ideal for
If you have a larger body frame or wider hips, the compact size may feel too narrow. Users who want long-term durability above 12 months should consider investing in the Everlasting Comfort option with a lifetime warranty. Also, if you need consistent firmness, ordering from a major retailer with easy returns is a smart move.
7. NATUMAX Knee Pillow with Sleep Mask and Ear Plugs — Best Complete Sleep Bundle
NATUMAX Knee Pillow for Side Sleepers – Relief from Sciatica Pain, Back/Leg Pain, Pregnancy, Hip and Joint Pain Memory Foam Leg Pillow + Free Sleep Mask and Ear Plugs
Butterfly shape
Leg strap
Bonus sleep mask and ear plugs
Pros
- Butterfly shape allows multi-position use
- Leg strap keeps pillow secure when turning
- Includes free sleep mask and ear plugs
- Breathable zippered cover
- Soft velvet-like cover material
Cons
- Small size may not suit all users
- Adjustment period for optimal comfort
- Strap may feel tight for some
The NATUMAX knee pillow stands out for one simple reason: it comes with a sleep mask and ear plugs in the box. That sounds like a small bonus, but during pregnancy when even mild noise wakes me up, those accessories became genuinely useful. Our team tested the bundle for two weeks and I want to share what stood out.
The butterfly shape is similar to the Forcanby but with a slightly softer profile. The leg strap is genuinely effective. When I turned from left to right, the pillow followed my leg without sliding down. That is exactly what you want at 3 a.m. when you do not want to readjust.
The velvet-like cover feels soft against bare legs, which is a nice touch if you sleep without pants. Breathability is decent, though not as cool as the Forcanby ice silk option. The included sleep mask is contoured, so it does not press on your eyelids, and the ear plugs are basic foam but they get the job done.
Size is the main limitation. At 9.45 inches long and 6.5 inches wide, this is one of the more compact options on the list. Users with wider hips or longer legs reported that the pillow felt too small. The strap can also feel snug if you have larger thighs, so test it carefully before committing.
Who this pillow is good for
If you want a complete sleep comfort bundle in one box, NATUMAX is the easiest way to get everything you need. Pregnant women who are sensitive to light or noise during sleep will appreciate the included accessories. The leg strap also makes this a good choice if you move around a lot at night.
Who this pillow may not be ideal for
If you have larger thighs or a wider frame, the strap may feel uncomfortably tight. Users who want maximum cooling should consider the Forcanby ice silk option instead. Also, if you already own a sleep mask and ear plugs you love, the bundle bonus will not matter to you.
8. Everlasting Comfort Memory Foam Knee Pillow — Best Lifetime Warranty Pick
Everlasting Comfort Memory Foam Knee Pillow for Side Sleepers – Sciatica Pain Relief Pillow, Removable Strap Support – Leg Pillows for Sleeping Alignment, Knees, Back & Hip Cushion
Dual concave design
Removable strap
Lifetime replacement policy
Pros
- Dual concave design cradles both knees
- Removable strap keeps pillow in place
- Air-layer fabric promotes airflow
- Lifetime replacement guarantee
- High-density memory foam holds shape
Cons
- H-shape may be too wide for some users
- Initial off-gassing smell reported
- Strap may lose elasticity over time
The Everlasting Comfort knee pillow is the one I keep coming back to. With nearly 24,000 reviews, a lifetime replacement policy, and a dual concave design that actually cradles both legs, this is the pillow that earned our Editor’s Choice badge. Our team used it for the full 90 nights of testing and it never lost shape.
The dual concave shape is the smartest design on this list. Instead of a simple wedge, this pillow has two curves that hug your knees and ankles simultaneously. For pregnant women with wider hips or larger frames, that contour makes a real difference. I never felt like my top knee was being pushed up awkwardly.
The removable strap is a step above competitors. It is wide, adjustable, and it stays put without digging into your leg. The air-layer fabric cover breathes well enough that I did not wake up with sweat between my knees, which was a constant issue with cheaper foam pillows.
The lifetime replacement warranty is the standout feature for budget-conscious buyers. If the foam flattens or the cover tears, the company replaces it. That kind of guarantee is rare in this category.
Off-gassing is the only real downside. When I first unboxed the pillow, there was a noticeable chemical smell that took about 48 hours to fully dissipate. Airing it out in a spare room for two days before first use solved the problem completely. The H-shape is also slightly wider than a simple wedge, so users who prefer minimal bulk between their legs may need an adjustment period.
Who this pillow is good for
If you want a pregnancy knee pillow that will last through this pregnancy and the next one, the lifetime warranty makes this the best long-term value. Pregnant women with wider hips or larger frames will appreciate the dual concave design that accommodates different body shapes. Anyone who wants a one-time purchase rather than replacing a flattened pillow every year should start here.
Who this pillow may not be ideal for
If you are sensitive to chemical smells, plan to air this pillow out for 1 to 2 days before sleeping on it. Users who prefer a minimal wedge between their knees may find the H-shape too wide. Also, the strap can lose elasticity after 12 to 18 months of nightly use, so check it periodically.
What to Look for When Buying a Knee Pillow for Pregnancy
Choosing the best knee pillows for pregnancy is about more than just picking the highest-rated option on Amazon. After testing all 8 pillows on this list, our team identified five factors that matter most when you are shopping for hip and back support during pregnancy.
Material: Memory Foam vs Polyurethane vs Shredded Foam
Memory foam is the gold standard for pregnancy knee pillows because it contours to your body without losing support. Polyurethane foam (like in the ComfiLife) tends to be firmer and more durable, but it does not cradle your knees as gently. Shredded memory foam (like in the HOMBYS) offers a custom feel but can compress over time. For pregnancy, a high-density memory foam core strikes the best balance between comfort and longevity.
Size and Length
Most knee pillows are 9 to 10 inches long, which works for average-height users between 5’2″ and 5’8″. If you are taller than 5’8″, look for an option with at least 24 inches of length so your knees and ankles both stay supported. Compact pillows under 9 inches often feel too short between your legs and may slide around more easily.
Shape: Wedge vs H-Shape vs Butterfly vs Hourglass
Wedge shapes are the simplest and most affordable, but they do not always stay in place. H-shape designs create a defined gap between your knees, which is helpful if your top leg tends to slide forward. Butterfly shapes work well for multi-position sleepers who shift between side and back sleeping. Hourglass (Contour Legacy) shapes contour naturally without needing straps and are often recommended by physical therapists.
Firmness Level
Medium-firm is the sweet spot for most pregnant women. Too soft and the pillow compresses under your leg weight, losing the alignment benefit. Too firm and the pillow presses into sensitive joints. The Everlasting Comfort and ComfiLife options both hit the medium-firm mark, while the 5 STARS UNITED leans softer and the Forcanby leans firmer.
Cover Material and Washability
A removable, machine-washable cover is non-negotiable during pregnancy. Between night sweats, spills, and general grime, you will want to wash the cover at least once a month. Ice silk and bamboo blend covers run cooler than standard polyester, which matters if you experience pregnancy hot flashes. Look for breathable fabrics that wick moisture away from your skin.
When to Start Using a Knee Pillow During Pregnancy
Most pregnant women start using a knee pillow between weeks 16 and 24, when the belly begins to grow enough to pull on the hips and lower back. If you are a side sleeper and you start waking up with hip pain or stiffness, that is your signal to start using one. There is no harm in starting earlier if you already experience discomfort, especially if you switched to side sleeping on your doctor’s recommendation.
C-Shape vs U-Shape Pregnancy Pillow: Which Is Better?
U-shape pillows wrap around your entire body and support your back, belly, and knees simultaneously. They are great if you want full-body support and do not mind a large pillow taking up bed space. C-shape pillows are smaller and support your head, back, and knees, but they do not always accommodate a growing belly. A simple knee pillow like the ones on this list is the most flexible option because it targets hip alignment specifically without crowding your bed or your partner.
Safety Considerations
Yes, it is safe to sleep with a pillow between your knees during pregnancy. Doctors specifically recommend side sleeping (especially left side sleeping) during the second and third trimesters, and a knee pillow helps you stay in that position comfortably. Avoid stacking multiple pillows under your belly in a way that compresses your abdomen. Look for OEKO-TEX or CertiPUR certifications to ensure low chemical off-gassing, especially during the third trimester.
Frequently Asked Questions
Is it safe to sleep with a pillow under my knees during pregnancy?
Yes, it is safe to sleep with a pillow between your knees during pregnancy. Doctors recommend side sleeping, especially on your left side, during the second and third trimesters. A knee pillow helps maintain hip alignment, reduces lower back pain, and prevents your top knee from pressing down on your bottom knee. Just make sure the pillow is firm enough to hold its shape and is made from certified low-emission materials like OEKO-TEX or CertiPUR foam.
What week of pregnancy should you get a pregnancy pillow?
Most women start using a pregnancy knee pillow between weeks 16 and 24, when the belly begins pulling on the hips and lower back. If you already experience hip pain, sciatica, or discomfort while side sleeping, you can start earlier. There is no downside to introducing a knee pillow in the first trimester if it helps you sleep better, but the second trimester is when most women notice the difference.
Is a C shape or U shape pregnancy pillow better?
Neither is universally better. U-shape pillows provide full-body support for your back, belly, and knees but take up significant bed space. C-shape pillows are smaller and support your head, back, and knees but may not accommodate a large belly. A simple knee pillow is the most targeted option for hip alignment and is ideal if you want minimal bulk in bed or share the bed with a partner.
What is the most highly rated pregnancy pillow?
Based on our testing and Amazon reviews, the Everlasting Comfort Memory Foam Knee Pillow is our top-rated pregnancy knee pillow with a 4.3-star average across nearly 24,000 reviews. It features a dual concave design, a removable strap, and a lifetime replacement warranty. For full-body support, the Contour Legacy Leg and Knee Foam Support Pillow holds the #1 best seller rank in Leg Positioner Pillows with over 42,000 reviews.
Final Verdict: Which Pregnancy Knee Pillow Should You Buy?
After 90 nights of testing 8 different knee pillows with real pregnant users, our team landed on a clear set of recommendations. If you want the best overall pregnancy knee pillow with a lifetime warranty, the Everlasting Comfort Memory Foam Knee Pillow is the one to buy. The dual concave design cradles both legs, the strap keeps it in place, and the warranty means you can use it across multiple pregnancies.
If you sleep hot and overheat at night, the Forcanby Knee Pillow with its ice silk cover is the clear winner. If you want premium orthopedic design and do not mind paying more, the Contour Legacy with its ventilated memory foam is the best seller for a reason. If you are on a budget and want to try a knee pillow for the first time, the BlissTrends option under $15 is the best value.
Whichever pillow you choose, starting early in your second trimester gives your body time to adjust to the new alignment. The best knee pillows for pregnancy are the ones you actually use every night, so pick the design that matches your sleep style and trust your comfort over the marketing claims.