Merax Mesh Adjustable Chair, Black [Breathable Mesh Back and Seat]This Boss mesh office chair has been designed to prevent body heat and moisture build up. The breathable mesh fabric seat provides ample padding for all day comfort. [Ergonomic Design]The human ergonomic design back naturally fit the human body with back curve. You will not feel tired even sit for a long time. [Dual Wheel Casters]Beautiful and stable metallic sliver painted metal base. Dual wheel casters is rolling fluently and almost no sound when moving the chair. [Adjustable Height and Tilt Lock]The Height adjustment and tilt tension control offer full range of motion and freedom of movement, so you can easily find the position that's right for you. 20"L X 20"W X 46.5"H. Seat Size: 19" x 20"(W x D).Seat height: 17.7"- 21.6" (adjustable height).Back size: 19"(W) x 29"(H).