Argomax Ergonomic Mesh Office Chair High Back Swivel Desk Chair Adjustable Headrest Armrest Tilt Back and Tension 5 ERGONOMIC ADJUSTABILITY. The ergonomic mesh office chair by Argomax is designed exclusively with all the necessary adjustments including adjustable headrest, tilt back and tension, 2D padded armrest as well as seat height to fully support proper posture. Allow you to target problem like the lower back and make the chair conform to your body, supporting healthy circulation and making sitting for hours a day easier on the back and spine. SMART AUTO ADAPTIVE BASE. Thanks to modern intelligent technology, the smart adaptive base can automatically adjust suitable elastic force of the chair back according to the weight of the user, for which the elastic force can be maintained at a balanced range when it comes to people of various weight. 2 IN 1 LEVER AND S HIGH BACK. Easy to adjust seat height and tilt back with only 1 lever. Simple to adjust tilt tension with the black gadget. 135-degree tilt back and 3-position tilt lock, together with S-shaped high back design, make it effortless for you to recline with comfortable head, neck and back support to have a good rest in case sometimes you are too tired after work. HIGH END AND RELIABLE. Argomax ergonomic mesh office chairs have been certified by BIFMA and SGS. High quality eco-friendly material with more than 5 years lifespan. Nylon and glass fiber frame. Breathable mesh back. Soft padded armrest. Dense foam waterfall seat. Explosion-proof air rod. Firm 5-star base which supports weight up to 330lbs. PU mute caster wheels. (Note: Not cheap recyclable materials) EASY INSTALLATION WITH FULL KIT. The package includes 1x head pillow, 1x back frame, 1x seat cushion, 2x armrests, 1x chassis (which has been assembled on the cushion), 1x gas rod, 1x 5-star base, 1 set of casters, 1 set of screws and 1x detailed manual. 1-year warranty. Should you have further query please do feel free to contact and we promise to reply within 24 hours. 100% satisfaction guaranteed.