Professional Breathable Mesh Back and Layered Leather Seat Ergonomic Chair with Adjustable Lumbar Support. Thick Padded Contour Leather Seat and Breathable Mesh Back with Built-in Adjustable Lumbar Support. One Touch Pneumatic seat Height Adjustment. Dual Function Control with Seat and Backrest Angle Adjustment and Seat Slider. Adjustable Tilt Tension Control. Patent 4 Way Adjustable Arms Movements include Upwards/Downwards, In/Out, Side to Side, Swivel Inwards Only. Heavy Duty Gunmetal Finish Base with Oversized Dual Wheel Carpet Casters.