Ergonomic Design: The ergonomic office chair has an "S" backrest ergonomic design back and adjustable lumbar support to fit the natural curve of the lower back and take the pain of spinal away from your body. The high back of this home office chair can be adjusted up and down by 4". Our ergonomic office chair is made by high quality nylon material , which is stable and strong. Flexible Adjustments Functions: Our ergonomic office chair features a multi-stage height-adjustable headrest, lumbar support, and 3D armrests for a customized fit. The ergonomic office chair can be tilted from 90° to 120° to 135°,and the cushion can be adjusted back and forth. Comfortable and Breathable: With high-quality reinforced mesh, our ergonomic office chair keeps your back cool and comfortable while keeping you focused and relaxed. It also has soft PU padded armrests and high-density sponge cushion for enhanced comfort. Quick and Easy Assemble: Soohow big and tall ergonomic computer des