ERGONOMIC BACK SUPPORT - Breathable mesh, adjustable headrest armrest and firm lumbar support form an S-shaped structure. This ergonomic chair supporting your back while allowing air flow to keep you cool, large Size 20*18*3inch environment friendly high resilience seat cushion is good for sitting long hours. NUMEROUS ADJUSTABLE FEATURES - Independently adjustable headrest, lumbar support, armrests, and cushions support multi-level height adjustment to suit different body types. Recliner office chair backrest supports 90 to 135 degrees tilt adjustment. BREATHABLE MESH CHAIR - The mesh back and mesh seat keep air circulation for extra comfy. High quality mesh resists abrasion and transformation, it makes the high back computer desk chair good for sitting for 4 ~ 8 hours, perfect for a long day sitting. DURABLE & RELIABLE CHAIR - 300 lbs maximum load, and silent casters metal base improved safety and stability. Silent casters effectively protect the floor.