[Ergonomic] Ergonomic chair 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] Adjustable seat height with a 3.5" vertical height range; Sprint tilt mechanism and an upright lock provide additional customization and comfort; Seat dimensions: 20"W x 18"D x 18”-21.5” [Stable Base & 360° Swivel] Dual wheel casters and 5-star 25-inch chrome base allow for easy movement and provide added stability; 275-lb. weight capacity [Quality Materials] Upholstered in vinyl for easy cleaning and maintenance; Designer horizontal ribbed back and seat cushion bring a modern aesthetic; MAS Green Certified [Assembly & Dimensions] Ships ready to assemble; Installation manual provided below; Product dimensions: 20"W x 26"D x 36.5”-40”