The Carex Semi Roll Pillow is ergonomically designed to provide ideal spinal alignment and a therapeutic sleep posture to reduce head, neck, shoulder and back discomfort. Can also be used under the back, knees or ankles. The high quality memory foam in the Carex Semi Roll Pillow reacts fast to provide instant relief and comfort, and provides slow memory foam recovery for longer support. The removable soft polyester and rayon cover zips off easily for machine washing. Hypo-allergenic.