The pillow can be used to cool or warm yourself. The warm side is made of flocking and the other side is smooth and cool with the cooling coating inside. It is small and portable after air bleeding. Besides, it can substitute for the cool-water-soaked towel to cool yourself. With the heat insulating coating it can absorb the heat slowly. Those who are easy to catch cold can lay the towel or some cloth on the pillow or choose the normal temperature side to prevent them from getting cold. Whenever you are traveling or taking a nap, just take this useful pillow.