"I tried the Pillow Cube Classic ($70), named such because it is, quite literally, a sturdy block of memory foam. At five inches thick, it lifts and holds my head at just the right distance from the bed, and my shoulders don't get all scrunched and smooshed while I sleep. The charcoal bamboo memory foam ensures that my head never gets too hot. (There is no "cool side" of the pillow because it just doesn't get too warm in the first place.) The pillowcase that comes with the cube is also quite soft! As someone who has been attached to the squishiest of pillows all my life, I'm actually shocked that I now prefer the firmness of the Pillow Cube." — Maggie Panos, senior editor, Voices
If you want to read more, here is the Pillow Cube Classic review.