Ergonomic back design and waterfull seat design, its make it healthier and comfortable.The metal frame more comfortable than wooden framework.24 d high quality density foam, high technical wood armrest, bifma 5.1 gas lift, special pu castor, the chair weight capacity more than 300lbs Carton size:84*28*60cm Package:1pc/ctn Net weight of chair:15.5kg/pc Gross weight:17.5kg/pc