The Premier One General Use Foam Cushion is designed to provide users comfort and stability. The aerated foam helps to keep the user cool and dry while the low-shear water-resistant stretch cover helps maintain sensitive skin integrity. 12" tie straps secure the cushion to the wheelchair and the waterproof vinyl bottom protects the wheelchair seat. Size: 18" (W) x 16" (D) x 3" (H). 4/case.