Bathtub Rail Dual Level Diabetes Care Adaptive Feedback Cancellation (AFC) The Hip Kits Adaptive Feedback Cancellation (AFC) The whistle (feedback) will be reduced by this function when you use the device 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 Bathtub rail provides a high low grip support with two textured finish gripping areas including a straight crossbar * Chrome finish prevents rust * Size: 12 W x 16 H * Weight capacity: 250 Lbs clamps extend 3 1 2 to 6