Boss Office Products B9091-GY Dimond Task Chair with Adjustable Arms in Grey 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 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 Available in 4 standard fabric colors