Fashioned with dual wheel casters, the Boss Black Caressoft Medical Stool With Back Cushion easily moves from one area of the room to the other. Users appreciate the ergonomic design that works with the spine to reduce stress and improve comfort. The seat and back are made using Caressoft vinyl upholstery, which is not only attractive in appearance, but also easy to clean in between appointments. The height of the seat is adjustable with a 6" range using the pneumatic gas lift. In addition to this model with the back cushion, users can also purchase model B240 if no back cushion is required. No infinite lock