LUMBAR TECHNOLOGY: Patented dynamic lumbar support system that pivots to move with your body for continuous lower back support to help maintain a positive posture in any seated position. ERGONOMIC SUPPORT: A contoured backrest, layered body pillows, adjustable height, tilt tension, well-padded headrest and molded arm rests combine to support your whole body. Durable base with 360º dual-wheel casters support up to 275 lbs. BREATHABLE UPHOLSTERY: The backrest of this Ergonomic chair is made of a perforated bonded leather, with mesh surrounds, that allow air to circulate more easily through the seat to keep you cooler and more comfortable for extended periods. SERTA COMFORT: All Serta chairs use layers of quality non-toxic foam that provide long-lasting, supportive cushioning. Upholstered in smooth bonded leather and available in 4 colors: Black, Cream, and Gray. EASY ASSEMBLY: Step-by-step instructions make assembly simple. Two people are recommended. We offer USA Customer Support