Comfort Seat Cushion Orthopedic Tri-foam Concept Cover Air Mesh Black Cotton Velour Grey Size M - Below 80kg Wt.(17.5 x 15.5 x 3 inch) L - 80kg to 100kg Wt.(18.5 x 17 x 3 inch) XL - Abv 100kg Wt.(18.5 x 17 x 3 inch) Features of Comfort Seat Cushion Right Combination of Memory Foam, Super soft Foam and High Resilience Foam Extra Soft at the Rear Part of Cushion to Off Load Pressure From the Spine Washable Cover with an Anti-skid Bottom Designed for Office/Computer Chair & Wheelchair Use of Comfort Seat Cushion Prevent the Back, Sciatica & Tailbone Pain Ideal for Long Sitting Hours