Bid goodbye to backaches and strains arising from bad posture or poorly designed office chairs. With this ergonomically designed, black fabric Diamond task chair, comfortable posture comes standard. Its simple, clean design incorporates wide, contoured seat and back, with adjustable arm rests and height, making your work or study hours pass by painlessly. Contoured back and seat provides support and helps relieve back strain. Extra large seat and back cushions. Pneumatic gas lift seat height adjustment.