I got this pillow for my husband who loves flipping over his pillow for the “cool side.” I always put protective covers on my pillows to keep them clean. When he first tried this pillow, it felt cool, but didn’t stay cool for him. After a week of giving it a chance, and it still not being cool, I took the protective cover off it and he tried again. It just didn't stay cool for him. He said that the pillow was comfortable, though.