With impressive array of ergonomic features, the Butterfly Chair gives you total control over your seating experience. Design supports the body in all-day comfort and provides an ergonomic fit for many body types. Stylish, breathable, split-panel mesh back includes angle adjustment, tilt-lock in three positions, and tilt tension control. Back is contoured to provide optimum and natural lumbar support. Back also features a convenient built-in coat or jacket hanger. Easily adjust the breathable mesh seat depth with the seat glide control. Seat measures 20" wide x 20" deep, and height adjusts from 18" to 21" on a smooth pneumatic cylinder. Curved headrest (13" wide x 6" high) is breathable, features 2-1/2" of height adjustment, and pivots to give correct neck support whether upright or reclining. Armrests pivot and adjust 3" in height to work with a variety of work spaces, positions and activities. Chair includes a durable five-star base with dual-wheel casters for smooth mobility.