Boss Office Products B1002-GY High Back Task Chair in Grey High-back styling upholstered with commercial grade fabric Sculptured waterfall seat made from molded foam; Ratchet back height adjustment Adjustable height armrests with soft polyurethane; Width adjustable armrest Large 27" nylon base for greater stability; Hooded double wheel casters Pneumatic gas lift seat height adjustment; Adjustable tilt tension control High-Back Styling Upholstered With Commercial Grade Fabric/Sculptured Waterfall Seat Made From Molded Foam That Contours To The Shape of Your Body Ratchet Back Height Adjustment Allows Perfect Positioning of The Back Cushion For Lumbar Support Adjustable Height Armrests With Soft Polyurethane and Width Adjustable Armrest Allows The User To Move The Armrests To Match Shoulder Breadth Large 27" Nylon Base For Greater Stability and Hooded Double Wheel Casters Pneumatic Gas Lift Seat Height Adjustment/Adjustable Tilt Tension Control with Seat Tilt Lock and back angle lock