18 (w) X 18 (d) X 2 (h) Gel-u-seat Lite General Use 2 Gel/foam Wheelchair Cushion. Offering Great Versatility The Gel-u-seat Lite Provides Comfort To Almost All Wheelchair Users. Unique Dual-chambered Gel Bladder Keeps The Pelvis In Contact With Pressure Redistributing Cooling Gel. The Cover Is Fluid Resistant Low-shear Nylon; Zippered And Removable With A Durable Vinyl Bottom. Secures Easily To Wheelchair With 12 Tie Straps. Meets Flammability Standard Tb117.