Sihoo Vito M90 Ergonomic Office Chair with Footrest Seat Adjustable Height Deluxe Mesh Chair Back Support It is a great fusion of art and science, with flex zones that ensure constant support of back and lumbar with BAS System (Back Automatic Supporting System), multi-dimensional adjustable armrests for unparalleled support, and a height-adjustable pivoting headrest for full cranial support.The Ergonomic chair is designed specifically for those who are in an office chair for extended periods of time and require intensive-use seating for comfort. It has multi-lock Sync mechanism, pneumatic height adjustment, automatic lumbar support system, height adjustment arms and headrest all in one unique ergonomic chair.Features 【 Comfortable Lumbar Support】 Do you have back pain? SIHOO home office chair with lumbar support will be the best choice to protect your spine from the pain and fatigue of sitting for a long time. Adaptive elastic waist support can automatically provide support strength based on body weight and contact angle. Choose this swivel chair if you always sit in the office for long 【Breathable Mesh 】 SIHOO ergonomic office chair is made of high quality breathable mesh, which provides support while ensuring air circulation, so you can stay cool and comfortable even after sitting for a long time. The high quality mesh prevents wear and tear and sudden changes, providing you with long-lasting comfort 【Highly Adjustable】 The adjustable headrest, 3D armrests and back tilt provide you with better support when you sit on our computer chair. You can choose 3 positions between 90° and 123° to tilt the backrest, or you can adjust the backrest up and down according to your height and sitting position, suitable for people from 5'5" to 6'2" . 4" seat height adjustment with 360° free rotation offers enhanced convenience 【High Quality and Easy to Assemble】 The gas lift of this high back office chair has passed BIFMA and SGS certification, as well as the 2504 lbs static...