Cipher Mesh Back Task Chair, Supports Up To 300 Lb, 15" To 20" Seat Height, Black Seat, Charcoal Back, Charcoal BaseCrack the code to productivity with intuitive functionality and thoughtful design. Keep things simple with a weight activated control that automatically adjusts as you move. Personalize your sit with independently adjustable lumbar support. Elevate your aesthetic with a thin, modern profile and open back design. Stay cool with four way stretch mesh that flexes in every direction to dynamically move with you. Note: This is a non returnable item.