About this item Breathable mid-back design: Featuring densely knitted mesh backrest, this mesh office chair allows better airflow, accelerating heat and moisture dissipation. Mid-back design supports your spine's natural curve and protects your lower and middle back as it prompts you to sit straight. Robust chair construction: This mid-back office chair is constructed of hard-wearing nylon mesh, durable star base, solid rolling casters and SGS-certified gas cylinder.It has passed BIFMA X5.1 Test and is recommended for office use for customers under 300lb. Larger seat for optimal comfort: In this model, we upgraded the seat size, measuring 52.5cm/20.7 (width) by 51cm/20 (depth), and 7cm/2.8 thick, to provide you with a softer and larger sitting area. Adjustable seat height: The seat height of this computer mesh chair can be simply adjusted from 33.5cm/13.2 to 43.5cm/17.1 by a little push-up/press down at the lever under the seat according to your needs. Reclining office chair: By simply