Comfort is a function of smart design, and smart design comes from understanding individual needs. The Improv X.L. is proportionately larger than our H.E. model to comfortably seat any user, while mingling easily with other Improv seating. The seat height ranges from 15″-22″, the chair back adjusts 4″ vertically, and the seat depth adjusts 3″. The chair also features a synchronized tilt and is certified to hold up to 500 lbs.