Anji Ergonomic Adjustable Mid Back Mesh Office Desk Chair with Lumbar Support and Arms Dual Smooth-rolling Nylon Wheel casters great for studying darfting and gaming. Built-in lumbar support and padded seat for all-day comfort and support Tilt Tension ControlLocking Knee-Tilt Control Mechanism Overall size: L 23.4 x W 24.0 x H 38.6" - 42.5", seat height (lowest-highest): 18.5" - 22.4" CA117 Fire Retardant Foam, 1-year limited warranty.