Ultra adjustable ergonomic chairs allow personalized positioning for all-day comfort and improved productivity. Extra thick 3-1/2" padding is covered by durable fabric upholstery. Waterfall contoured design helps reduce stress on knees. Contoured back provides lumbar support. High Back Chair has 23-1/2"W x 20-1/2"D seat and 23-1/2"W x 27"H back. Standard height adjustable T-arms also adjust side-to-side. 19" to 23-1/2" pneumatic seat height adjustment. 3-1/2" thick cushion. Polished aluminum base with 2" dual wheel carpet casters provide easy mobility. Easy assembly. 1 Year Limited Warranty.