Ergonomic Office ChairThe newly upgraded Balmstar ergonomic office chair is made of new composite aluminum alloy and environmental grade high temperature resistant material, adjustable backrest tension and 45° tilt high back computer chair, providing multi-angle support points (head/back/hip/hands). Double lumbar support can give your back enough support to effectively prevent cervical spondylosis and help prevent back strain and muscle fatigue. High-Density Breathable Mesh & CushionThe backrest and headrest are made of flexible, high-quality, non-patterned, breathable polyester mesh that allows air to flow freely to keep you cool and comfortable at all times. Stain-resistant & skin-friendly 3D air mesh task chair. The aerospace material's high-density shaped cotton-filled seat cushion resists deformation and provides foam-like comfort to balance softness, durability and support to reduce pressure on your hips and tailbone.