Just place this hinged memory foam pillow between thighs to align hips and relieve low back pain; beneath thighs or calves for comfy elevation; or under feet for soothing massage. Polyurethane. Removable 80% cotton/20% polyester cover is spot clean. Imported. 11 1/4" x 7 3/4" x 7" when closed. Requires 4 AA batteries (not included).