For years, I woke up multiple times a night to readjust my elaborate pillow setup, only to get out of bed in the morning with a sore neck, a stiff shoulder, and lower back pain. Side sleepers know the struggle: aching joints, pins-and-needles tingling (hello, T. rex arms), and the feeling that no pillow is ever quite right. Then I found the pillow shape that solved the side-sleeper problems my towering pillow stack never could.
For two months, I tested two of the most popular ergonomic pillows designed especially for side sleepers, the Coop Original Crescent Adjustable pillow and the Eli & Elm Ergonomic Side Sleeper pillow. One became my permanent nightly go-to. The other was a close second for a very specific type of sleeper.
The Coop Original Crescent pillow delivers plush, adjustable comfort
The crescent-shaped version of Coop's bestselling adjustable pillow is designed for side and back sleepers. The contoured cut-out makes room for your shoulder and closes the "neck gap" to ensure proper alignment and support.
I expected to like the shape. I didn't expect the Coop Crescent pillow to replace my entire pillow setup.
After letting it expand and giving it a quick spin in the dryer, I was ready to see how it stacked up against the variety of pillows I had been using. The gentle curved shape was everything I needed. My head felt supported, my shoulder had plenty of space, and I wasn't constantly shifting around to get comfortable.
It's soft, a little plush, and has just enough give that you won't have to fight it into place. That part clicked in right away for me.
A few weeks in, though, I started to notice that my head was sinking a little more than I wanted. It wasn't uncomfortable, but I did wake up a few times to adjust it throughout the night. It's filled with a mix of cross-cut memory foam and microfiber, giving it a soft, plush feel. But that also means it can compress a little if you don't have the right loft dialed in. Adding some of the extra fill to the center of the pillow and gently molding it into place was the fix.
The adjustability is the real value of the Coop pillow. You're not stuck with whatever loft it comes with. You can make it perfect for your particular sleep needs. Because it leans softer, I sometimes used an extra pillow to give me a little extra height when I was sitting up in bed to read or watch TV.
Side sleepers will immediately appreciate how the Coop pillow replaces the whole "pillow setup" routine. You get the shape you need, plus the ability to fine-tune it.
Related: The best pillows for side sleepers, according to a certified sleep coach
The Eli & Elm Ergonomic Side Sleeper pillow provides support and structure
Side sleepers will love how well the unique shape of the Eli & Elm Cotton Side Sleeper Pillow supports their neck, head, and shoulder for optimal spinal alignment.
The Eli & Elm Side Sleeper pillow is the one I kept coming back to.
It's firmer than the Coop, but nowhere near as stiff or dense as solid memory foam. There's still plenty of give, but the cut-out is more defined than the Coop pillow, almost pointed through the center and at the ends. I soon learned how much that matters to me.
At night, I moved less. I wasn't waking up to adjust my pillow. My head, neck, and upper back felt consistently supported, even when I rolled onto my opposite side or back. It's easy to find the sweet spot no matter what your position, which is a plus for combination side and back sleepers.
The fill is a mix of latex noodles and memory foam, which gives it a little bounce and a more structured feel overall. Less sink, more support. If the Coop feels plush and adjustable, the Eli & Elm pillow feels built and ready.
There are a couple of trade-offs. You can adjust the fill level, but the zipper opening is short, so getting the fill in and positioning it where you need it takes a little extra effort. When I filled mine, I noticed that the pile of fill left white, grainy debris behind on my comforter.
Still, I didn't really need to adjust the Eli & Elm pillow. For me, it felt right out of the box, and that's ultimately why I'm still using it every night. If you want a pillow that feels dialed in from night one, this is the right pick.
Cons of a crescent-shaped pillow to consider
Crescent pillows solve a real problem for side sleepers, but they're not for everyone.
The biggest adjustment is the shape itself. If you're used to a standard rectangular pillow, it can feel a little different at first. You're not flipping it around, stacking, or bunching it up, which is kind of the point, but it does take a few nights to get used to.
They're also less versatile. If you switch sleeping positions a lot or prefer to sprawl across your pillow, the curved shape can feel limiting. And while some options are adjustable, not all of them are easy to tweak. If you care about getting the perfect loft, that's something to pay attention to.
Still, for side and combination sleepers, those tradeoffs tend to be worth it. The shape solves a problem most standard pillows cause.
Related: The best sleep products, tested by the BI Reviews team
The final verdict: should you buy a crescent pillow?
Personally, I preferred the Eli & Elm crescent pillow over the Coop, since I preferred the bouncy, firmer feel. But this isn't a case of one pillow being better than the other. It's more about how you like your pillow to feel. If you want a plush pillow that you can fine-tune, go with the Coop Original Crescent pillow. If you need something more structured and supportive, go with the Eli & Elm Ergonomic Side Sleeper pillow.
Both pillows solve the same problem in different ways.
The Coop is softer and more forgiving. If you like a plush pillow or aren't sure what loft is right for you, it's the best place to start. You can tweak the fill level until it feels just right, and once you do, the difference is noticeable.
The Eli & Elm is more structured. The shape is more defined, the support is more consistent, and it feels dialed in right out of the box. I moved around much less when I slept on it, and didn't feel the need to adjust the fill level or the shape at all.
That's ultimately why the Eli & Elm edged out the Coop Original for me.
Either way, the biggest upgrade is the shape.
Why you can trust Business Insider's pillow reviews
Not everyone has the time, budget, or patience to test dozens of pillows to find the one that works for them. That's exactly why hands-on testing matters.
At BI Reviews, we don't recommend pillows based solely on product pages or specs. We sleep on them. We test how they feel on the first night, how they hold up over time, and whether they actually solve the problems they claim to fix, like shoulder pressure, neck support, or constant readjustments.
Our team has tested hundreds of pillows across sleep styles, materials, and price points, including top picks in our guides to the best pillows, the best pillows for side sleepers, and the best body pillows.
For this story, I spent eight weeks sleeping on two popular crescent-shaped pillows, paying attention to whether each made a difference in my sleep quality. I recorded how they felt out of the box, how easy they were to adjust with the included extra fill, and whether I slept through the night without waking up to "fix" my pillow position.
That combination matters because pillows are one of those things that look simple online but are surprisingly personal in real life. Specs can tell you the fill type and loft. They can't tell you whether you'll still be comfortable at 2 a.m.
That's the question our testing is designed to answer.
The crescent-shaped version of Coop's bestselling adjustable pillow is designed for side and back sleepers. The contoured cut-out makes room for your shoulder and closes the "neck gap" to ensure proper alignment and support.
Side sleepers will love how well the unique shape of the Eli & Elm Cotton Side Sleeper Pillow supports their neck, head, and shoulder for optimal spinal alignment.
