Boss - BOPB9476BK Executive chair with a mid back features CaressoftPlus upholstery to give you an ultra-soft seat that's both breathable and durable. This trademarked vinyl looks and feels like leather yet cleans easily with just a damp cloth. Fixed, padded arms are ergonomically designed to provide extreme comfort through extended use. Pneumatic gas lift allows easy seat-height adjustments to help you find the personalized sitting style that suits you and your work environment. Spring-tilt mechanism allows you to change the angle of the entire seat relative to the floor and to transfer some of your upper body weight to the backrest of the chair. The 27" chrome base offers extra stability to the chair by spreading the load over a larger surface area to help prevent tipping. Hooded, double-wheel casters slide smoothly on floors to make it easy to move and shift directions. Executive chair supports up to 275 lb.