Sihoo M57 Ergonomic Office Chair, Computer Chair Desk Chair High Back Chair Breathable,3D Armrest and Lumbar Support Black with FootrestHigh Quality SIHOO office chairs have been certified by BIFMA and SGS, passed 1000kg static pressure test. It can carry a weight of up to 150kg. Every part of this computer office chair has strict safety quality testing, cushion impact test, handrail fatigue test, chair foot static pressure test, ect. Simple instructions enable anyone to put chair together in eight simple steps! Long Hours Sitting The mesh back and mesh seat keep air circulation for