The Comfort Series provide a balance seating environment to help reduce stress on the muscles of the thighs, back, neck and shoulders. This Multifunction Task Chair model features an inflatable lumar support that is orthopedically designed to give a customized adjustment. Swivel seat includes a pneumatic height adjustment. Back and seat are constructed of a durable acrylic/poly blended uphostery. Five-star base is formed from nylon and includes dual hooded casters. 250 lbs rating. Gray fabric. Easy assembly.