Alera ALEEBW4213 EB-W Series Pivot Arm Multifunction Mesh Chair, Black/Aluminum Frame Advanced ergonomics combined with intelligent design fits most any user Pivoting swing arms adjust inward when leaning forward for close-in tasks or swing out to accommodate the wingspan Arms also adjust up or down and front and back Synchro-tilt and seat incline controls adjust seat to back ratio for the most optimal ergonomic seating position Advanced micro-mesh back fabric is both comfortable and cooling with durable molded foam fabric seat for the perfect sit