Contouring foam extremely comfortable foam material helps prevent back hip strain anti slip keeps you safely in your seat and ensures seat pivots with your body swivel 360 for smooth easy movement in either directions 360 rotation seat cushion pivots a full 360 for ultimate ease of use allows users to get in and out of any seat machine washable cover features a removable cover that is machine washable portable light weight design solid base with non skid surface weight capacity 330lbs enables a person to twist and turn while helping to prevent hipand back strain ideal for use in your vehicle home or office ball bearing roller mechanism slip resistant bottom