START A PRODUCTIVE DAY: Don't let the unpleasant seating affect you at work. With a height adjustable range of 18.5″-22.4″ and a back tilting angle of 90°-135°, this office chair allows you to find your proper sitting position and keep working efficiently ENDLESS COMFORT: This ergonomic chair with a tilt mechanism has S-shaped backrest and well-padded seat, letting your body rest so you can concentrate on work while sitting in ergonomic luxury DETAILS MATTER A LOT: The seat cushion, backrest, and lumbar support is padded with premium high density sponge that won’t easily deform; no matter for work or play, the ergonomic backrest mimics the curves of your body, providing continuous support SAFE SEAT: The auto-return cylinder has passed testing of ANSI/BIFMA X5.1-2017, Clause 8 & 10.3 by SGS (test no.: AJHL2005001130FT, holder: supplier), which ensures safe, long-term use Assembly required SIMPLE ASSEMBLY: With the numbered parts, an assembly kit, and detailed instructions, simply assemble the chair by tightening a few screws, that’s it! You’ll be joining your teammates before you know it