Amazon.com: SIHOO M18 Ergonomic Office Chair for Big and Tall People Adjustable Headrest with 2D Armrest Lumbar Support and PU Wheels Swivel Tilt Function Black : Office Products
Did they update the SIHOO M18? : r/OfficeChairs
Sihoo M18 Ergonomic Office Chair: The Perfect Solution For Your Back Pain! | H2TechVideos - YouTube