High Quality - SIHOO office chairs have been certified by BIFMA and SGS, passed 1000kg static pressure test. It can carry a weight of up to 150kg. Every part of this computer office chair has strict safety quality testing, cushion impact test, handrail fatigue test, chair foot static pressure test, ect. Simple instructions enable anyone to put chair together in eight simple steps!Long Hours Sitting - The mesh back and mesh seat keep air circulation for extra comfort. High quality mesh resists abrasion and transformation, , making the high back desk chair suitable for a long-day sitting of 8 hours. Meanwhile, it allows you to sit without feeling hot or sweaty. It also features easy maintenance, please wash the mesh in warm water on a gentle cycle with a cold-water rinse.Adjustable 3D Armrest -This office chair from SIHOO features 3D adjustable armrests - go forwards and back, up and down, and rotate 36 for the best fit to your favorite position. No matter in appearance or the function, it makes perfect sense of technology and future. Find the best angles for your posture.Ergonomic Design - SIHOO is recommended by Ergonomics Application Association. Ergonomic design is based on the human body dynamic digital model. The S-shaped backrest mimics the human spine which helps release the spinal pressure, with more effectively adjustable lumbar pillow to cherish. The flowed waterfall arc seating design thigh support lets you sit a more comfortably, relaxed posture.Note: it is recommended that this chair be placed on hard floors or a floor mat; if on a carpet or rug, please do not to drag the chair while sitting on it as additional weight coupled with the friction of the carpet/rug could cause the castors to get stuck, malfunction or breakProduct Details Type: Desk Chair; Executive Chair; Home Office ChairSeat/Back Material: MeshRecommended Weight Capacity (Single Chair): 150 KilogramsCastors Included: YesAdjustable Seat Height: YesAdjustable Back: YesSwivel: YesGas Lift: YesStyle: ContemporaryBox Contents: 1 x office chairCare Instructions: Do not use strong liquid cleanersAssembly Required: YesProduct Warranty: 1 yearsFrame Material: Nylon, PP, plastic, iron, AluminiumBase Material Details: AluminiumDimensions:Overall: 62cm Wx 63cm D x 106cmHMaximum Overall Height: 115cmMinimum Overall Height: 106cmMaximum Seat Height - Top to Bottom: 50cmMinimum Seat Height - Top to Bottom: 42cmOverall Product Weight: 22.5 KilogramsOverall Package Size: 77cmx66cmx35cmWe accept Change of Mind returns for 14 days after you have received the item in cases where you have changed your mind or made an incorrect purchase and wish to return the product. This also applies to orders cancelled when the item has already been dispatched from our warehouse. The item must be in a re-saleable condition to qualify for a change of mind refund. Deductions may apply including Initial and Return Shipping, as well as restocking fee of 20% of the product price Delivery excludes the following postcodes:2880-2889, 5201-5749, 4309-4453, 4580-4693, 4454-4499, 4694-4802, 4804-4805, 9920-9960, 4803, 4806-4999, 9961-9998, 2648, 2715, 2717-2719, 2731-2739, 3221-3334, 3342-3349, 3351-3352, 3357-3426, 3444-3688, 3691- 3749, 3812-3909, 3921-3925, 3945-3974, 3979, 3984-3999, 2264-2281, 2311-2484, 2487-2499, 2533-2554, 2575-2599, 2621-2639,2642-2647, 2649-2707, 2710- 2714, 2716, 2720-2730, 2787-2879, 6215-6700, 6701-6797, 7020-7049, 7054, 7109-7150, 7155-7171, 7173-7247, 7255-7257, 7330-7799If your postcode is within the above ranges then please contact us for a postage quote.