Product details:

ERGONOMIC CHAIR WITH ARMS You'll feel the difference with this ultra adjustable chair that allows personalized positioning for day long comfort and improvedproductivity. Extra thick 3-1/2 padding is covered by durable 100% acrylic fabric upholstery for an attractive look. Waterfall contoured design helps reduce stress on yourknees. Contoured back provides lumbar support. Extra large 20W x 19-1/2D seat and 19-1/2W x 20H back. Height adjustable T-arms align arms and wrists correctly for data entry. Arms also adjust side-to-side. Polished aluminum base with 2 dual wheel carpet casters provide easy mobility. 15-1/2 to 19-1/2 pneumatic height adjustment. Easy assembly.