The Leap chair by Steelcase has a back that changes shape to support the entire spine. This can reduce the chance of lower back sag and a hunched posture, which may weaken disc walls, stress back ligaments and cause deterioration of the spine. As you recline the seat glides forward so you can recline without leaving your Vision and Reach Zone making it easier to stay oriented to your work. This encourages more varied postures so there's less static load on the spine. the chair offers excellent breathability with slats in the back and seat to control heat and moisture. The seat height adjusts pneumatically. A 5" range of adjust ability (15"H to 20"H from floor). Height Adjustable Arms, adjust up and down (4") so you can find a natural position that comfortably supports the wrists, forearms, shoulders and neck.