Formed to fit you—our ergonomic vinyl upholstered chairs feature a contoured waterfall seat cushion and an adjustable back rest with lumbar support for increased comfort. Upholstery color: Black. They easily adjust in height with a smooth pneumatic circle adjustment range of 21" - 28"H. They come standard with black non-marring glides, but optional self-braking, non-locking casters are available with a weight capacity of 300 lbs. All backed by a 15-year warranty—lifetime on the pneumatic lift.