Mcombo Modern Ergonomic Mesh High-Back Computer Office Chair Executive Task Desk Seat w/ Nylon Base 7014 ?Comfortable Ergonomic Design --- Midback and full waist cushion is designed according to ergonomic. High-back Design --- Designed to fit the natural shape of the human back, providing comfort and support to the low back. ?Nylon Base, Smooth Gliding Caster Wheels. Tilt Tension Adjuster. ?Adjustable height from 16.5- 20.5". Weight Limit: 300LB ?Mesh Managers Mid Back Office Computer Chair ?The chair can be quickly and easily assembled.