[Ergonomic] Ergonomic design emulates the natural shape of the spine to increase comfort and productivity. The gas lift allows the user to modify their height in relation to their work surface, leading to an increase in comfort and ergonomic benefit [Adjustable Height] Adjustable seat height with a 3" vertical height range; Seat dimensions: 19.5"W x 18.5"D x 18.5”-21.5”; Overall max product height: 41”; Adjustable tilt tension control & upright locking position [Quality Materials] Upholstered backrest in breathable mesh and durable seat fabric bring easy maintenance and comfort; Versatile flip-up arms; MAS Green Certified [Stable Base & 360° Swivel] Dual wheel casters and 5-star 25-inch nylon base allow for easy movement and provide added stability; 275-lb. weight capacity [Assembly & Dimensions] Ships ready to assemble; Installation manual provided below; Product dimensions: 24.5"W x 25.5"D x 38”-41"H