[Memory Foam Material] This seat cushion is made of polyester and memory foam, shaped like a doughnut with an ergonomic "U" cutout, conforms to the contours of the lower body and provides natural support. [Detachable and Washable] Our coccyx cushion has a breathable mesh that doesn't trap heat, keeping you comfortable and cool while sitting. The donut seat cover is removable and machine washable. [Pain Relief] This seat cushion can relieve hemorrhoids, hip bursitis, coccyx fractures, herniated discs, bedsores, anal fissures, ischial tuberosities, and coccyx fractures, stress related to childbirth, vaginal surgery, and prolonged sitting can cause lower back, buttocks, legs pain. [Widely Uses] This donut pillow is suitable for most office chairs, gaming chairs, office chairs, computer chairs, standard dining chairs, car driver seats, sofas, wheelchairs, and recliners. Material: Polyester, memory foam Size: 40 x 34 x 7cm Color:black Note: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 2. Please allow slight dimension difference due to different manual measurements. Thank you for your understanding. Parts List: 1 x Donut Pillow Seat Cushion