Stage IV is designed for children ages 12-15. The pillow is constructed of 100% viscoelastic memory foam. It is sensitive to pressure and heat, which allows it to conform to your child’s natural contours and enhance support. Pillow is covered in a Columns Healthy Cover™. Covers are made of a 100% Polyester Interlock material laminated to a 1 mil clear membrane and utilize the environmentally friendly non-toxic Aegis Microbe Shield®. Dimensions are 14.75x19.5x3.3