SpinalCush Comfort Coccyx Memory Foam Seat Cushion Includes 2 washable and removable covers: Black Cool Ventilated Cover & Warm Blue Velour Helps to reduce pressure on the coccyx and hip bones while sitting on chairs, car seats, planes and wheelchairs Helps with treatment of sciatica, pressure ulcers, injured tailbone, numbness, pressure sores and more. 70% High Grade Memory Foam Density for ultimate support. Large design for extra support. Specially designed Anti-Slip bottom to stick to any surface.