Ergonomic Office Chair - High Back Desk Chair With Adjustable Lumbar, Black Product Details ?Features? Ergonomic Office Chair Featuring reliable ergonomic support, It's easy to adjust seat height, headrest, backrest and arms to meet different needs, the breathable mesh back and passive lumbar support good for sitting long hours. ?Material?High quality mesh resists abrasion and transformation, and the mesh back and mesh seat keep air circulation for extra comfy, Aluminum alloy base?Silent casters move freely without noise. ?Design?The ergonomic chair has been designed and researched by professional orthopedic doctors and mechanical engineers. Based on strict standards, it has undergone professional testing and repeated experiments, and has been tested by people of different heights and weights, meeting all safety and health standards for office chairs. ?Adjustable?Big and Tall Office Chair ,3D adjustable armrest for different office applications, 90-125arbitrary backrest tilt adjustment for multiple work and rest positions, 360 Freedom to rotate freely. ?Warranty?The product warranty period is 3 years. If there are any quality issues, please contact us. We will replace the accessories or a brand new chair for you. And we promise that all services will be provided for free. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.