HON basyx VL251NW10 VL251 Series Armless Task Chair, 100% Polyester, Black Upholstery/Frame Distinctive ergonomic design reflects advanced comfort research. T-shaped back reduces pressure points while it supports the upper body. Adjustable seat height and a back design that allows users to sit in comfort. Upholstered back and seat are durable and easy to clean. Frame and base are molded from fiberglass-reinforced resin for increased durability.