Cushion Cover only Roho HP Heavy Duty 22 x 18 Hip Knee Post Surgical Prdct ProBasics Three in One Steel Commode with VB604 GN ProBasics Three in One Steel Commode with Plastic Armrests Standard single step * Overall size: 16 W x 12 D x 6 Protects ROHO cushions from rough wear and tear fluids and the degenerating effects of poor quality ozone * Helps protect the cushion from rugged use and every day wear and tear * Protects against incontinence with its fluid resistant material and durable construction * Although this new cover is ruggedly designed it still allows for the benefit of the therapeutic skin protection of the ROHO cushion * Allows for easy access to ROHO cushion valves and the ISOFLO Memory Control© on SELECT Series cushions with a double pull zipper *