Our Casa Copenhagen desk chair using high-density sponge cushion, more flexible, office chair with a middle back design, can provide good Lumbar Support. The mesh chair uses a high breathable mesh back to make your back feel comfortable. The Casa Copenhagen chair comes with all hardware & necessary tools. Follow the desk chair instruction, you'll found easy to set up, and computer chair estimated assembly time in about 15mins. It is a good choice to add one of our Casa Copenhagen chair in your office, put a desk chair in front of your home, and put a set of our computer chair in your activity room. The cushion of chair, armrest accord with human body engineering design, let your body and mesh chair perfect fit, suit long time use.