Combining stylish design with ergonomic innovation, these chairs provide you with optimized sitting comfort. CH05-8 is not only a comfortable office chair, but a healthy and active lifestyle. It is designed to address the common issues during the worktime. With high density molded foam cushion, this chair could support long-time sitting comfort. Height adjustable seat also ensures the ergonomic seating posture while people working in front of their desk, mesh surface also allows better ventilation, now get one for your office, and get active today! Breathable Mesh Back: adds air circulation and cooling (particularly during summertime) Pneumatic Seat-Height Adjustment: quick and easy adjustment regulated height of chair relative to the floor High Elastic Molded Foam: relieves sedentary pressure for optimum comfort PU Hooded Casters: can make scratch less and work perfect on carpets and any hardwood floors Height-Adjustable Armrests: adapt to various sizes and positions reducing fatigue Adjustable Tilt Back: lean back, sit upright, or rock with built-in tilt tension lever underneath the seat Adjustable Lumbar Support: alleviates lower back pain during long periods of sitting Seat-Depth Adjustment: provides better seating experience Adjustable Headrest: provides exceptional support for head comfort