Boss Office Products B9091-CS Dimond Task Chair with Adjustable Arms in Black Mid back ergonomic task chair; Upholstered in Black Caressoft vinyl Contoured back and seat provides support and helps relieve back strain Extra large seat and back cushions Pneumatic gas lift seat height adjustment With adjustable arms Mid back ergonomic task chair Contoured back and seat provides support and helps relieve back strain Extra large seat and back cushions Pneumatic gas lift seat height adjustment Caressoft vinyl fabric