Convergence Mid-Back Task Chair, Swivel-Tilt, Supports Up to 275 lb, 16.5" to 21" Seat Height, Red Seat, Black Back/BaseMesh back is breathable for all day comfort and support. Seat flexes and stretches to make the soft foam even more responsive. Thick seat cushions to take the stress off the lower body throughout the day. Lumbar support that adds a little extra lower back comfort. Height and width adjustable arms move to put the support right where you want it.