Why does your bed pillow get warm? Basically, the heat generated by your head (remember youre 98.6 and the room is probably 20-30 degrees cooler) is absorbed by the pillow and it ultimately causes you sleep discomfort. Our proprietary cooling fabric keeps you cooler during the warmer summer months or perfect year-round if youre warm sleeper. The other side of the pillow is a breathable 100% cotton cover which is great when its a little cooler outside, or if you tend to keep the thermostat turned down a few degrees (save energy). Our pillow is filled with the perfect amount of white goose feathers for a medium firmness great for all sleeping positions. | Serta Goose Feather Pillow, King (2) in White