Boss - BOPB6223BK Drafting stool features a luxurious seat and breathable mesh back to help distribute weight evenly and provide back support by conforming to your unique back shape. Pneumatic gas-lift mechanism allows you to quickly adjust your height to accommodate any work area. Adjustable, flip arms provide maximum comfort and flip up when they're not needed. Dual-wheel casters roll smoothly for effortless movements. Spring tilt mechanism, tilt tension, and upright lock offer more ways to adjust the chair to meet your personalized standards of comfort. Drafting stool is designed to support up to 275 lb.