The Alvin Premo Ergonomic Task Chair has a contoured cushion so you can sit comfortably all day. Molded foam on the seat and backrest fully supports your body. Adjust the height and depth of the backrest and use the spring-tension mechanism to meet all of your needs. The nylon base has attached dual-wheel casters that roll smoothly over most surfaces and the seat height adjusts for your convenience. Available in several upholstery styles.