【ERGONOMIC BACKREST】The open mesh design creates a breathable, well-ventilated backrest, yet with its resilient mesh, the back moulds to your back providing a more supportive seat, which helps align the spine and reduce pressure and muscle fatigue. 【BREATHABLE PADDING SEAT】The padded mesh seat is thick and resilient. Made from premium quality high density thick sponge and a breathable mesh clothe, preventing body heat and keeping your hips and legs cool and sweat-free. 【MULTI-FUNCTION MECHANISM】Pneumatic controls make it easier to raise or lower the seat. The rocking mode can relax you from heavy work, pull out the handle to start rocking and pull it in to stop. This chair can support up to 250 lbs of weight.