【Ergonomic Office Chair】The ergonomic chair provides 4 support points (head/back/hip/hands) and proper lumbar support. SIHOO designs ergonomic chairs to meet different needs, with seat height, headrest adjustment, lumbar support and back support adjustment, suitable for long sitting and reduce your pain. Suitable for people 5'6" to 6'2" tall; 【For Home and Work】SIHOO chairs can be applied in different scenarios according to the needs of different consumers in needs. Can be used as student office chairs, computer chairs, ergonomic chairs, desk chairs, gaming chairs; not only can sit comfortably, but also save money; 【Breathable Mesh】Mesh Office Chair Premium Backrest features flexible non-pattern mesh fabric while keeping your back cool and comfortable, allowing you to sit focused and relaxed at the same time; 【High Quality & Easy Assembly】This home office desk chair passed the BIFMA test and the 1136kg static pressure test. Our ergonomic office chair can support up to 330 lbs. 1. Adjustable 2D Headrest, adjustable seat height, armrests, backrest, lumbar pillow. 2. Breathable and comfortable seat cushion 3. Noise free on different kinds of floor 4. Wide usage for work, study, releax, gaming 5. Pass SGS and BIFMA testing 6.enviromental material SIHOO series office chair packages: One chair with all parts; Installation tools; User manual;Pair of protection glove