CoolHut ergonomic office chair with lumbar Support and Adjustable Height. This ergonomic chair has an C-shaped curve design. The back support office chair can relax the backrest at an angle of 120 degrees and adjust the armrests rotated to 90 degrees. The seat cushion of the home office chair is high-density, breathable and resilient padded thick. Heavy-Duty Base with maximum capacity 250 lbs.