Unique contour tractor seat evenly distributes body weight to minimize pressure under thighs and help eliminate body fatigue. Contour back and inflatable lumbar pump customize support. Back and pneumatic seat height adjustment. Seat depth adjustment. Carefree acrylic/poly blend upholstery. Black nylon base. Adjustable footrest. Seat: 21w x 19d. Back: 17w x 18h. Seat height 23" to 33". Shpg. wt. 40 lbs. Manufacturer’s limited lifetime warranty. Assembly required. Casters supplied with this chair are not suitable for all floor types. Alternative casters are available to meet your specific needs. Optional Adjustable Arms (TIF12ADJARM), sold separately. Alternative casters are available to meet your specific needs. Casters supplied with this chair are not suitable for all floor types.