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 armrests allows the user to move the armrests to match shoulder breadth. Large 27-inch nylon base. Pneumatic gas lift provides instant seat height adjustment. Adjustable tilt tension that accommodates different size users. Seat tilt lock allows the seat to lock throughout the tilt range. Back angle lock allows the back to lock throughout the angle range for perfect back support. Dimensions: Arm Height: 24.5-inch H x 31-inch W, Seat Size: 20-inch W x 19-inch D, Back Size: 19.5-inch W x 23-inch H, Seat height: 18-inch - 22-inch H, Overall Dimensions: 30.5-inch W x 27-inch D x 38.5-inch - 44-inch H. Assembly instructions also available at www.bosschair.com.