Mid-back stool offers a breathable mesh back; height-adjustable, Variable-Resistance Lumbar (VRL) support and upholstered cushioned seat to enhance your comfort. The multifunction arms adjust in height and width. Soft polyurethane arm pads slide into a position that suits your needs with four locking positions. Functions include pneumatic seat-height adjustment and 360-degree swivel. Black, five-star nylon base is equipped with smooth-rolling casters for easy mobility. Weight capacity is 250 lb. Mid-back chair meets or exceeds BIFMA standards.