Activ® A-37 Office Chairs, Mesh, Black, 275 lbs. CapacityContoured backrest with adjustable lumbar support Breathable mesh fabric on backrest Injection molded foam seat Pneumatic seat height adjustment, 17. 5 21" Comfortable and durable armrests with height, pivot and telescopic adjustments Advanced synchro tilt mechanism with multiple locking positions Tilt tension adjustment Sliding seat adjusts and locks in various positions to suit a wide variety of users Colour: Black Material: Mesh Weight Capacity: