The Carex® seat Cushion is made from premium quality self-molding memory foam and provides a comfortable seating surface.  It is ergonomically designed to help maintain proper posture and provide stability while seated.  This handy cushion comes with a removable soft polyester and rayon cover that zips off easily for machine washing.  Hypo-allergenic.  Blue cushion measures 18" l x 16" w x 3" h.