ERGONOMIC & ACTIVE DOUBLE 3D-LUMBAR SUPPORT: Look no further, this is a life saver! Adjustable 3D backrest works like two hands always tightly and closely hold your back and spine from right and left, designed to closely postured to your LUMBAR and BACK, fit your back curve. Always keep your back supported. Reduce spine and back fatigue. You will not feel tired after sitting 8-10 hours a day. W-SHAPED SEAT CUSHION fits your hip curve to reduce weight pressure. Organic polymer foam padding adds more comfort: Breathable textured fabric, resist transformation with high Density shaping Foam and abrasion to keep you comfortable during long, intense sessions. You are able to swivel 360° and adjust the height, headrest and backrest in accordance with your desire. ROCK BACK AND FORTH between 90 and 130 degrees, Lock at 90 degree upright position. The durable base can go the distance with its five-pointed chromed steel construction and sturdy easy-rolling castors. The computer task chair can support up to 300 pounds. 10-MINUTE EASY INSTALLATION - We provide you with installation instructions in the box. The instruction is very simple to follow, no extra tools and fittings needed, one person can assemble it.