HIGHLY BREATHABLE MESH: Made with a premium high elasticity, polyester mix mesh, which promotes air circulation. Airflow removes heat and moisture created by the body for improved comfort during long periods of sitting ERGONOMIC SUPPORT: Contoured mesh backrest conforms to the contours of your back and provides a good level of lumbar support which promotes a positive sitting posture SERTA FOAM & CERTIFICATION: All Serta chairs use quality non-recycled, non-toxic foams, exceed minimum industry testing standards and are certified by the American Chiropractors Association FUNCTIONAL & DURABLE: Sturdy nylon base supports up to 275 lbs. and rolls quietly on 360º dual castor wheels with a seat-side lever for height adjustment and tilt-lock. Mesh has a high wear resistance to extend the life of this desk chair EASY ASSEMBLY: Simple and quick assembly with hardware kit included. Estimated 10-15 minutes assembly. We offer USA Customer Support