The Sonik Bank-Tek Pillow is ergonomically shaped to cushion your neck and head, providing maximum supportive comfort for a good night's sleep. It is reversible, with warm micro fleece on one side for winter and cool brushed polyester on the other for summer. - Warm micro fleece on one side for winter - Cool brushed polyester on the other for summer - Removable case for easy washing - Main outer fabric 100% polyester, filling 100% polyester