Task chair features a versatile design that's augmented by a mesh back with lumbar support and a breathable mesh fabric to help you stay cool and comfortable. Adjustable arms can be moved up or down to ensure a perfect fit for most people regardless of height or arm length. Pneumatic gas lift allows easy seat-height adjustments to help you find the personalized sitting style that suits you and your work environment. Spring-tilt mechanism allows you to change the angle of the entire seat relative to the floor and to transfer some of your upper body weight to the backrest of the chair. The 25" nylon base offers extra stability to the chair by spreading the load over a larger surface area to help prevent tipping. It also offers a ratchet back height adjustment, adjustable tilt tension control and more. Task chair supports up to 275 lb.