Upholstered with mesh material, which allows air to pass through, adding to long term comfort by preventing body heat and moisture to build-up. Mesh back provides the perfect level of support by conforming to each individuals back shape. Pneumatic gas lift seat height adjustment. Adjustable tilt tension control. 25" nylon base. Hooded double wheel casters. Adjustable height arms. Black upholstery with a Black frame. 26-1/2"W x 25"D x 41-1/2"H Overall Dimensions.