HOMBYS Memory Foam Knee Pillow Review: The Best Pillow for Side Sleepers?

If you’re a side sleeper who’s tried those small, compact knee pillows only to wake up with the same knee and back pain, you’re not alone. Most knee pillows on the market are cube-shaped with a small indent—and they just don’t provide enough support for your entire leg.

The HOMBYS Memory Foam Knee Pillow takes a different approach. At 18 by 30 inches with a 4-inch thickness, this leg pillow extends from your knee all the way down to your ankle. I’ve been testing it to see if the extra size actually translates to better pain relief.

The short answer? It does what the smaller pillows couldn’t. But it’s not for everyone—especially if you travel often or sleep in a warmer room.

What I Liked

Extra-Long Full-Leg Support

The standout feature of this knee pillow for side sleepers is its length. At 30 inches, it provides support from your knee all the way down to your ankle. This prevents the leg-caving effect that plagues smaller knee pillows.

The trapezoidal design keeps your leg in place as you sleep. Switching sides during the night doesn’t require wrestling with the pillow to get it back into position—a common frustration with compact alternatives.

Quality Memory Foam Construction

The HOMBYS uses 38-density memory foam, which lands in the medium-firmness range. It compresses under pressure but springs back to its original shape—the hallmark of genuine memory foam.

This high-resilience foam doesn’t flatten over time like cheaper alternatives. The pillow maintains consistent support night after night, which matters for long-term pain relief.

Effective Pain Relief

The core purpose of any leg pillow is separating your knees to prevent bone-to-bone contact. This memory foam knee pillow does that well, but it goes further by supporting your entire lower leg.

By keeping your pelvis neutral and your legs properly aligned, it addresses the root cause of many side sleeper’s back pain issues. The pressure distribution across the full leg length prevents the twisted pelvis position that standard knee pillows often fail to correct.

Multiple Positioning Options

This isn’t a one-trick pillow. You can use it between your legs for traditional side sleeping, under your knees while on your back, or turned sideways for partial leg support.

For back sleepers, placing it under the knees relieves lower back pressure—a position I found helpful for morning stretching. The versatility means you’re not locked into a single sleep position to benefit from it.

Machine-Washable Cover

The outer cover removes easily and goes straight into the washing machine. Use cold water on a gentle cycle, and it holds up well. Given that this pillow sits between your legs every night, easy maintenance matters.

What Needs Improvement

Not Travel-Friendly

The same size that makes this pillow effective at home becomes a liability when you travel. At 30 inches long and nearly 4 pounds, it won’t fit in any carry-on or standard suitcase.

If you travel frequently, you’ll need a separate compact knee pillow or an inflatable alternative. This is purely a home-use product.

May Sleep Warm

Memory foam naturally retains heat, and this pillow is no exception. Some users report it feels warm during summer months or in bedrooms without air conditioning.

The microfiber cover doesn’t offer much in the way of cooling. If you already sleep hot, consider whether a foam pillow between your legs will work for you.

Too Large for Shorter Users

Users under 5’3” may find the 30-inch length excessive. The pillow extends beyond what shorter legs need, and the extra bulk can feel awkward.

One Amazon reviewer at 5’1” noted it was “way too long” for her frame. If you’re petite, the smaller 3-inch thickness version or a different brand might suit you better.

How It Compares

The HOMBYS sits in the middle of the knee pillow market at $38.99. Here’s how it stacks up against popular alternatives.

Coop Sleep Goods Orthopedic Knee Pillow ($45) offers something HOMBYS doesn’t: adjustability. Removable foam inserts let you customize the thickness and firmness. If you’re unsure what support level you need, this flexibility is valuable. However, it’s shorter than the HOMBYS and doesn’t provide full-leg coverage.

Helix Side Sleeper Knee Pillow ($113) is the premium choice with high-density foam and an included strap to prevent shifting. For users who move a lot during sleep, that strap solves a real problem. But at nearly three times the HOMBYS price, you’re paying for a feature many sleepers don’t need.

Sleep Number Knee Pillow ($25) takes the budget approach with a compact hourglass design. It’s ideal if you want to test whether a knee pillow helps before committing to something larger. The tradeoff is the same limited leg support that HOMBYS specifically addresses.

The HOMBYS makes the most sense for home-based side sleepers who need more support than compact options provide but don’t want to spend premium prices.

Final Verdict

The HOMBYS Memory Foam Knee Pillow earns a 4.1 out of 5 rating. It solves a specific problem—inadequate leg support from compact knee pillows—and does it well.

At $38.99, it sits at a reasonable price point between budget options and premium alternatives. The 38-density memory foam holds up over time, and the machine-washable cover makes maintenance simple.

The limitations are clear: it’s not portable, may sleep warm, and won’t suit shorter users. But for home-based side sleepers dealing with persistent knee or back pain, this pillow delivers what smaller options can’t.

If standard knee pillows have failed you, the HOMBYS is worth trying.