I sleep hot, so I've been trying out various cooling pillows and products and this was the best. I love the cooling effect, but also the density of the pillow -- it feels like a gel-infused memory foam, very comfortable. In fact my wife liked my pillow so much, I got her a king-size!
Pillow is very cool and does not hold heat, so your head stays a comfortable temperature. Size is just right. Pillow starts out full and supportive but seems to end up later during sleep too flat and it has to be flipped.