This chair is AFRDI level 6 certified (without arms only) and Ergocare TM certified. It comes with gas lift height adjustment, independantly tilting back and independantly tilting seat – both of which can be locked in any position or free floating. A highlight of the Aura Ergo + is its “deluxe seat slide depth adjustment” which further enhances the overall ergonomic seating experience. It has a large back with generous lumbar support and ratchet height adjustable back and lumbar. It also comes with a full 10 year guarantee excluding upholstery.