M18, SIHOO's high back ergonomic office chair, can more effectively support the back and head compared with low back office chairs and leather office chairs, while providing larger sitting area. The seat cushion is made of soft sponge to keep your hips comfortable. The backrest is made of high-stretch breathable mesh to avoid stuffiness. High quality is gauranteed with numerous tests. Furthermore, we promise 24-hour online service, 30-day free returns, 60-day free exchanges, and 1095-day warranty. SIHOO M18 Ergonomic office chairs can give you a unique sitting experience!

• 【Waterfall Seat Cushion】: High-density sponge,waterfall edge and moderate hardness effectively relax your thighs.
• 【C-Shaped Backrest】: Highly elastic and breathable mesh works together with lumbar pillow that can be adjusted up and down or front and back to supports your back and waist effectively.
• 【PP Headrest】: Made of PP material, it can be rotated 45° and has a lifting function to effectively support your head.
• 【Nylon Armrests】: The armrests can be adjusted up and down to provide the best height and U-shaped surface effectively supports your arm.
• 【PU Casters】: The PU casters allow the chair to move smoothly and silently in different directions while not damaging the wooden floor.
• 【Trust-Worthy Quality】: The chair has passed static load test of up to 1136kg and the gas lift has passed the SGS and BIFMA tests.
• 【Multifunctional Adjustment】: 3-gear adjustable backrest (110° - 116° - 126°), height adjustable seat (10 cm), flexible lumbar pillow (5cm vertically adjustable and 4 cm horizontally adjustable),adjustable headrest(9 cm vertically adjustable and 45° rotation adjustable), and the liftable armrests (7 cm).