Heavily vented for maximum cooling This is the lightest TekVest available For offroad riders looking for the best in full side and frontal coverage Designed to be worn over/ under a jacket Wear your current backpack over top of this design Rear armor foam panel removed to increase airflow while wearing a backpack Traditional TekVest UHMW plastic back panel retained profile, raised and ventilated No other TekVest made flows this much air Will accept the standard optional TekVest shoulder pads