Comfort Cloud OPDX Coccyx Cushion Hybrid Gel, Breathable Mesh, Memory Foam Non-Slip Bottom Seat Cushion with Cover Premium 100% real memory foam coccyx cushion reduces impact and resists flattening over time Tailbone cushion with refreshing cooling gel layer, breathable air mesh cover, and BONUS plush Cyan velboa cover Seat cushion provides lower back, hip & tailbone pressure relief; Sciatica pain relief without sacrificing comfort or durability Bonus features include non-slip bottom to keep our chair cushion in place, extended zipper for changing/cleaning, and a convenient side carry handle Promotes proper vertebrae alignment. Our Premium Coccyx Gel Cushion has a full money back guarantee!