[EASY & QUICK ASSEMBLY] - The office chair comes with all hardware & necessary tools. Follow the desk chairs instruction, you'll found easy to set up, and adjustable chair estimated assembly time in about 15mins. RELIABLE COMFORT - Our 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.