John Krauss
Obsessive tester. Avid dreamer.
I'm passionate about good quality sleep. I tried fourteen pillows over the course of six months. I am reader-supported, and I may earn money from qualifying purchases.

In-depth Comparison (2022): Casper Original Pillow vs. Wondersleep Pillow

I tested 14 different pillows over the course of six months. I slept on each pillow for at least five nights each. I rated each pillow based on how comfortable it was to sleep on over an extended period of time, whether or not the construction seemed high quality to me, and my take on suitability for different body types and sleep positions. Here is an in-depth comparison of the Casper Original Pillow and Wondersleep Pillow.

At a Glance

Brand Name Casper Wondersleep
Pillow Name Original Pillow Pillow
Overall Rank #4 out of 14 #11 out of 14
Fill Type Polyester Fiber (Down Alternative) Shredded Memory Foam and Polyfiber Mix
Firmness / Softness Extra Soft Soft
Starting Loft 10 inches 6 inches
Sleep Positions Stomach, Back Stomach
Body Types Average, Big-and-tall Petite, Average
Filling Comfort
Construction Quality
Score Out of 10 8.8 6.5

Detailed Reviews

#4. Casper Original Pillow

Polyester Fiber (Down Alternative)

#4 out of 14
Extra soft but also extra thick. For back-sleepers who want a supportive, soft pillow
  • High-quality construction
  • Extra soft
  • Sinks in when laying down
  • Great for back-sleepers
  • Not fully adjustable
  • May be hard to fit into pillow case
  • Premium price
  • For side-sleepers, unlikely to get desired loft
Firmness / Softness: Extra Soft
Starting Loft: 10 inches
Sleep Positions: Stomach, Back
Body Types: Average, Big-and-tall
Filling Comfort:
Construction Quality:

The Casper Original Pillow uses a pillow-in-pillow design with two layers, both made of polyester fiber, at slightly different firmness levels. This creates a thick but soft pillow that is great for back-sleepers who want a polyester fiber pillow. However, I don't recommend this pillow for side-sleepers due to the lack of adjustability: the thickness combined with the softness results in an unpredictable loft.

The Casper pillow is great for back-sleepers, but I wouldn't recommend it for side-sleepers.

The most noticeable aspect of the Casper pillow is the loft: I measure it at 10 inches thick, the highest loft of any pillow tested. This is because the pillow is actually made up of a regular sized pillow covered by another layer of pillow. The outer layer can be unzipped to reveal the inner pillow sandwiched inside. The outer layer is extremely soft and thin. It resembles a comforter or a thick blanket. In fact, the pillow does remind me of a regular pillow wrapped in a comforter. The outer layer sinks completely in when used.

Unzipping the outer pillow reveals an inner pillow also made with polyester filling. Keep in mind that though the pillow can be unzipped, the filling cannot be adjusted. Unzipping doesn't give access to the filling. It only gives access to the inner pillow. While you can technically have three different lofts by sleeping on the inside pillow by itself, the outside layer by itself, and both layers combined, I wouldn't consider the pillow to be adjustable. I suspect most people will be sleeping on the pillow with all the layers together because either layer by itself is too thin for my preferences. Like the outer layer, the inner pillow sinks all the way down when I lay my head on it by itself. Based on my experience, neither the inner pillow nor the outer pillow will provide enough support for side-sleepers or back-sleepers individually. Theoretically, the inner pillow could be used for stomach-sleeping, but there are other options on the market that don't involve discarding half the pillow.

When used together, the pillows start at the full 10-inch-high loft. Laying my head down makes the pillow significantly thinner since both parts of the pillow are so soft. The inner pillow and the outer pillow compress all the way down when slept on individually, but the combined pillow does leave some loft simply because there is so much material. Unfortunately, as a side-sleeper, the loft feels slightly off for me, leaving my head angled uncomfortably. It's possible that some side-sleepers will find the loft level perfect, but I recommend that side-sleepers stick with a fully adjustable pillow like the Saybrook or Coop.

The Casper pillow and Sleepgram pillow share a lot of similarities. From the outside, they even look almost the same except for the different logos. There are three main differences, though. First, the Sleepgram pillow comes with two inner pillows. Despite this, both the Casper and Sleepgram pillows have the same loft, so the Sleepgram inner pillows are individually thinner compared to the Casper inner pillow. Second, the zipper on the Casper pillow feels to me like it's easier to operate compared to the zipper on the Sleepgram pillow, which contributes to my perception that the Casper pillow has higher quality construction. Finally, I find the Sleepgram pillow to be even softer than the Casper pillow. My head sinks down even more with the Sleepgram pillow. This is because the Sleepgram polyester filling glides more easily, so some of the material moves out of the way when I lay my head on it. The Casper pillow polyester fill is also soft, but it stays underneath my head, so even though it compresses, the material stays there to provide some loft.

Unlike some of the other pillows reviewed, the Casper pillow doesn't come with a separate cover. Inserting this pillow into a pillow case can be difficult due to the thickness. Though the pillow compresses easily when sleeping on it, getting it to compress from 365 degrees to shove inside a pillow case is relatively frustrating. It is far from impossible, but it does take more energy than it should. I find that when pillows are difficult to insert into pillow cases, I subconsciously avoid wash cycles.

The lack of adjustability makes the Casper pillow a non-starter for side-sleepers since the angle of the head is so important and everyone has a different shoulder and head size. For back-sleepers looking for a polyester fiber pillow, the Casper pillow is a great choice. Because of the thickness, even though the pillow sinks significantly, it still provides some support.

#11. Wondersleep Pillow

Shredded Memory Foam and Polyfiber Mix

#5 out of 14
An affordable pillow with a thin profile
  • Affordable price
  • Foam is certified by CertiPUR-US
  • Removable cover
  • Doesn't come with enough filling for me to consider it adjustable
  • Stiff memory foam chunks
  • Dominated by polyester fiber fill
Firmness / Softness: Soft
Starting Loft: 6 inches
Sleep Positions: Stomach
Body Types: Petite, Average
Filling Comfort:
Construction Quality:

On paper, the Wondersleep Premium Adjustable Pillow should be similar to the Saybrook and Coop pillows: it has shredded memory foam and polyester filling. However, that's where the similarities end. I selected this candidate because it was much cheaper than the other pillows while sporting the same reported features. I wanted to see what the difference was in person. Unfortunately, the pillow case quality, the adjustability, and the filling comfort level don't match up in my opinion.

The Wondersleep pillow has soft filling and a thin profile.

Immediately upon unpacking, I notice the pillow has much less filling compared to other pillows and is very thin. The thinness of the pillow defeats the purpose of the adjustability because it won't be in the loft range many people need. The loft might be okay for stomach sleepers who appreciate a thinner pillow. Though the initial loft measures at 6 inches, the pillow compresses a third of the way down for me when I lie down due to the softness.

The dominant feeling for me in the Wondersleep filling is the polyester fiber.

The sensation of the Wondersleep pillow fill is dominated by polyester fiber for me, with pieces of shredded memory foam buried throughout. The memory foam feels stiff, not just firm, as if it had been left out in the sun too long. The pillow reminds me of clumps of cattail fluff in the wild: mostly soft and fluffy but with random bits of hard seeds (or in this case, memory foam) inside.

Some pieces of foam in the Wondersleep pillow look yellowed.

Though many shredded memory foam pillows under $50 can look similar to the Saybrook and Coop pillows on paper, I recommend investing more to get the higher quality construction and better filling found in the top picks.

Picking the right pillow can be important. I did all the research here to make the process easier. I hope that this blog helps you as you make your decision.