Ergonomic Design] The ergonomic chair provides 4 support points (head/back/buttocks/hands) and proper lumbar support. The seat height, headrest and backrest easily adjusted to meet different needs. [Roller Blades Wheels] The roller blade wheels are silent and can move to 360° directions. It's soft and smooth which protects your floor without without noise and scratches. And it fits all types of floor, wooden, carpet and etc. [Breathable Mesh] The back and cushion are breathable. A high-quality mesh is used to make it steady, well-shaped and elasticity. May you have a comfortable experience. [3D Armrests] The Armrests are 3D Freely Adjustable. It can change to any directions to fit your arms. Even you can remove them for more space as you like. [ Easy to Install ] A detailed installation video is on the manual and related video section. You can easily and quickly install it by yourself. If you have any question, please contact us at any time, a professional after-sales service team is ready to provide satisfactory solutions. MRSP 259$