The breathable mesh back task chair is designed with comfort and ease in mind. It's seat cushion is upholstered in a durable and cleanable antimicrobial vinyl. The chair features a 2:1 synchro-tilt mechanism for added comfort. This allows the backrest and seat to tilt in unison.and it also includes a tilt tension knob which allows you to adjust the tilt tension for optimal support. The chair also features height adjustable arms, a pneumatic gas lift that allows for easily adjustable height and it has a maximum weight capacity of 275 lbs. The chair has a 27″ nylon base and 2 -inch hooded, double wheel, casters. Boss Office Products