Sit-Straight Basic Wheelchair CushionsHelp improve posture and help prevent forward sliding by combining a built in Solid Seat Insert with a superimposed wedge cushion The Solid Seat Insert ensures a flat sitting surface on wheelchair sling seats, while the superimposed wedge cushion effectively reduces forward sliding and sacral sitting Dark gray nonslip waterproof vinyl cover with ties 1 each LATEX FREE Yes, No MATERIAL Vinyl foam,Poly foam,Nylon Foam PRODUCT TYPE Wheelchair