The Alvin Salambro Jr. Mesh Back Chair (Black) is extremely comfortable and stylish. This finely crafted chair comes complete with armrests, pneumatic height adjustment from 18" to 22" and a 24" diameter reinforced nylon base with hooded casters. The extra-thick molded foam seat cushion is 18" w x 18" d x 3-1/2" thick and has a 2-to-1 synchro-tilt mechanism. For every 2 degrees that the back reclines, the seat automatically tilts 1 degree. The vented mesh backrest is 18" wide, rises 18" above the seat and has a spring-adjusted rocking mechanism that can be locked into the upright position. A padded lumbar support can be adjusted up and down for comfort.