Cover for Mini Max Cushion 18 x 16 Exercise Physical Therapy 5 D Warranty Limited lifetime Instrument and Solution Stands 5 D Warranty Limited lifetime on frame: One year on all parts Outside Width:24 Width Between Arms:17 Polished stainless steel * Perfect for writing or holding a lap top and easily folds when not in use * When open unit measures 17 W x 15 D x 3 H * Two way stretch top enables the cushion cells to conform to the individual's body shape without diminishing product effectiveness or therapeutic value * The cover has a stretch Lycra© top material that is a durable heavy weight fabric with a soft feel * The side material is composed of a 3 layered knit polyester spacer fabric which provides superior air circulation that ventilates and cools the user * The fluid proof solid non skid base material offers a durable easy to clean surface * The cover has the added feature of Velcro© straps placed on the bottom to allow the user to attach the cushion to their chair * Velcro© is a registered trademark of Velcro Industries BV * 18 x16 * Sales are FINAL on all cushion covers * Warranty: 6 Month Limited Warranty