Big & Tall Mesh Ergonomic Chair has heavy duty construction that allows it to support users up to 450 lbs. Breathable mesh back and thickly padded black mesh fabric seat for added comfort. Sturdy aluminum base has an attractive gunmetal finish and five dual wheel casters for easy mobility. 21-5/8"W x 19-5/8"D seat and 22-3/4"W x 27-1/8"H back. 18-1/2" to 21-1/4"H pneumatic seat height adjustment. Easy Assembly. 1 Year Limited Warranty.