Task chair. Black mesh upholstery allows air to circulate. Seat height adjustment, lumbar support, adjustable arms, tilt tension and tilt lock offer customized comfort. Overall Dimensions: 45.3" – 50.8" H x 28.2" W x 28.6" D. Seat Dimensions: 16.6" – 20.3" x 20.1" x 18.3" (H x W x D). Back Dimensions: 25.4" x 19.2" (H x W). Arm Dimensions: 25.0" – 31.8" x 20.2" (H x D). Adjustable head rest. Suitable for up to 10 hours of use per day. Supports up to 275 lbs. Chair Height: 45.3" – 50.8" H. Easy assembly - Easy to follow instructions with corresponding part packs to reduce confusion and assembly time. Meets or exceeds ANSI/BIFMA standards. 7-year manufacturer limited warranty.