BOSS THE MESH CHAIR W/3 PADDLE MECHANISM(YM8630),TU034 ARM Ergonomic open mesh back designed to provide exceptional back support. 3 paddle multi-function tilting mechanism. Breathable mesh fabric seat with ample padding. Adjustable height armrests with soft polyurethane pads. Seat tilt lock allows seat to lock throughout the tilt range. Back angle lock allows the seat to lock throughout the angle range for perfect back support. Padded back frame. Pneumatic gas lift seat height adjustment. Adjustable tilt tension control. Large 27" nylon base for greater stability. Hooded double wheel casters. Available with optional seat slider (B6008-SS)