JOBOON High Back Adjustable Mesh Executive Office Computer Desk Ergonomic Chair Lift Swivel Chair with Armrests,Mesh Office Chair Computer Desk Chair Black Mesh back keeps you cool,comfortable and breathable;Thick seat padding keeps you focused. Adjustable arms help your arms at the right height for typing with comfort;High-back & ergonomic design provides built-in lumbar support. Adjustable tilt and lock mechanism allows you to move the seat and back for stabality and flexibility. Ergonomic office chair's height can be raised or lowered;360 degree swivel rotation. Nylon base and durable nylon casters gurantee the weight rated up to 250 pounds;.2-year warranty free component-exchange.