Patented Design. NTR - No Tools Required Assembly. Beautifully upholstered in LeatherPlus. LeatherPlus is leather and polyurethane for added softness and durability. Available in Black or Bomber Brown upholstery. Waterfall seat design eliminates leg fatigue. Ergonomic back design with lumbar support. Upright locking position. Pneumatic gas lift seat height adjustment. Adjustable tilt-tension control. Large 27'' silver nylon base with black caps. Hooded double wheel casters.