Product details:

8-WAY ANTI-MICROBIAL ERGONOMIC CHAIR - VINYL Ultra adjustable anti-microbial ergonomic vinyl chair allows personalized positioning for day-long comfort and improved productivity. Extra thick 3-1/2" padding features anti-microbial vinyl upholstery that protects against mold and bacteria growth. Waterfall contoured design helps reduce stress on your knees and improve leg circulation. Contoured back provides lumbar support. Extra large 20"W x 19-1/2"D seat and 19-1/2"W x 20"H back. Polished aluminum base with 2" dual wheel carpet casters provide easy mobility. 15 1/2"-19 1/2" pneumatic height adjustment. Easy assembly. Also available, optional stool glides can replace casters for stationary use.