BOSS Chair B7401 HI BACK CARESSOFT CHAIR W/KNEE TILT Beautifully upholstered with ultra soft and durable Caressoft upholstery. Executive High Back styling with extra lumbar support. Padded armrests covered with Caressoft upholstery. Solid 27" nylon base with casters. Hooded double wheel casters. Upright locking position. Pneumatic gas lift provides instant seat height adjustment. Adjustable tilt tension control. Comes standard with knee-tilt mechanism. Matching guest chair with cantilever base (B7409).