Cardinal Health Essentials Quilted Reusable Underpads has four layer protection pads. Its top layer (patient side) is 80 percent cotton and 20 percent polyester blend (referred to as IBEX). The bottom (bedside) is a two layer PVC material that provides a waterproof non-slip backing. Features: 36" x 72" Reusable Underpad, Ibex Quilted. Non-slip, waterproof, PVC backing. Moderate absorbency 8 oz. soaker. Machine washable.