

This means that the material appears to move to the side when I lay my head on the pillow.

The Sleepgram polyester fibers glide very smoothly against each other, almost like silk strands. I would guess the difference between the Casper and Sleepgram softness comes from the friction in the polyester fibers. Even though the Sleepgram pillow starts at 10 inches of loft by my measurements, my head sinks so far into the pillow that I feel even less support than I get from pillows that start at half that loft. The Casper pillow is already so soft that my head sinks significantly, so I was surprised that the Sleepgram pillow had even less support. Both pillows have the same starting loft, but my head sinks in more when I sleep on the Sleepgram pillow compared to the Casper pillow. The first difference is the softness of the pillows. However, on a closer look, I found three main differences. In fact, when I first unboxed the pillows, I thought they were the same pillow with different logos. The Sleepgram pillow uses a pillow-in-pillow design similar to the Casper pillow. I kept all the inner pillows zipped inside for this picture, so this is how the Sleepgram pillow that I have sleeps in its firmest configuration. My head sinks in significantly when I sleep on the Sleepgram pillow. I would not consider it worth purchasing again at the price point that I paid. It's fun to try once, but I don't want to sleep on it regularly. Overall, I consider the Purple Harmony Pillow a novelty experience akin to a water bed. Because the Purple Harmony Pillow is not adjustable, I wouldn't recommend it for side-sleepers. Though I appreciate the different options, a one inch difference is the difference between a size 6 and a size 9 shoe (for both men and women), and I'd prefer a fully adjustable pillow that can accommodate sizes in between. The Purple Harmony Pillow comes in three different loft levels, but the options are separated by one inch each, according to the Purple website at my time of purchase. In my experience, I find the grid to be pretty effective in preventing sweat build-up, but if heat and sweat is a concern, down and down alternative pillows tend to be better for breathability than solid foam pillows in general. The grid serves mainly to provide aeration since solid foam pillows tend to trap heat and sweat against the sleeper. It is fun to squeeze, but when I lay my head on it, I mostly just feel the latex foam underneath. The substance of the grid feels like a gel-grip pen. The signature Purple Grid can be found in the cover of the pillow. The latex foam inside has an elastic bounce. The material feels like the grips in a gel-grip pen. The Purple Grid resides in the cover of the pillow.
