The Butterfly Ergonomic Fully Adjustable Office Chair from Balt is engineered to support the body in all-day comfort with an ergonomic fit for a wide spectrum of body types. It features a breathable split-panel mesh back that includes angle adjustment, tilt-lock in three positions, and tilt tension control. You can easily adjust the breathable mesh seat depth with the seat glide control. The seat measures 20 x 20", and its height adjusts from 18 to 21" on a smooth pneumatic cylinder. It also has a curved headrest that is breathable, features 2.5" of height adjustment, and pivots to give correct neck support whether upright or reclining. Arm rests pivot and are 3" height adjustable to fit a variety of work areas, positions, and activities. The back of the chair also features a convenient built-in coat or jacket hanger. This chair has a 5-star base with dual-wheel casters for smooth mobility.