ReActiv mesh-back design delivers total zonal comfort with the perfect balance of the right type and right amount of support. Advanced synchro-tilt mechanism with seat slider offers a full range of reclining positions. Tilt tension controls the rate and ease of recline and the upright tilt lock secures the chair in the full upright position. Unique, back-cushion-style lumbar support is height adjustable: up and down, to provide personalized support and extra relief where you need it. Pneumatic seat height adjustment moves the seat up and down to adapt to various body heights. Adjustable arms allow you to set their height and width to best accommodate you.