Lucky Gourd Coccyx Orthopedic Memory Foam Seat Chair Pad Cushion Office Car Stool Cushion 17.7''*13.4''*2.7'' (Red) This Memory Foam Seat Chair Pad Cushion cushion reduces pressure on the coccyx and hip bones while sitting Superior comfort for chairs, car seats, planes, and wheelchairs,promotes healthy posture and spine alignmentpromotes healthy posture and spine alignment Removable velour cover is machine washable and allows for easy cleaning Assists in the treatment of sciatica, pressure ulcers, injured tailbone and more You can't find cheaper price in the market than us and you don't need worry about anything when you purchase this cushion!It is fulfillment by Amazon,so you can return it anytime if you don't satisfied with it.