FY-LIVING Memory Foam Pillow for Neck Pain Relief and Sleeping, Cover Washable, Standard, 1-Pack REMOVABLE COVER:100% polyester, machine washable. SMOOTH SLEEPING SURFACE: The pillowcase cover has a good hand feeling, soft and smooth like newborn babies' skin. SWEAT-FREE SLEEP: Memory foam pillows has breathable comfort, they can respond to temperature and pressure and they are naturally resistant to allergens, mold, bacteria and dust mites. LONG LASTING FUNCTION: Memory foam maintains shape and great support throughout nights. This pillow will never go flat with use. ADJUSTABLE PILLOW: Memory foam pillow is designed perfectly for back and side sleepers. It's especially recommended to those who often suffer neck pain issues on sleep.