FY-LIVING Ventilated Memory Foam Pillow with Breathable Holes for Sleeping Cool, Queen, 1-Pack REMOVABLE COVER:100% polyester, machine washable. SMOOTH SLEEPING SURFACE: the inner cover with a side zipper is seamlessly sewed to a foam which encloses the filling of the pillow as well as soothes and evens the sleeping surface for a better sleep. SWEAT-FREE SLEEP: Memory foam pillows has breathable comfort, are naturally resistant to allergens, mold, bacteria and dust mites. LONG LASTING FUNCTION: memory foam maintains shape and great support throughout nights. It also responds to pressure to mold to your shape by creating all-around support. IT ADJUSTS TO THE USER NEEDS:: 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.