Slim fit stretchable fabric construction Features a floating, highly ventilated and flexible thermoformed chest protector for comfort and freedom of movement on the bike Central front zipper for a better fit and ease of donning Additional front padding on the arms and chest for enhanced roost protection Height adjustable kidney belt for an optimal fit BNS compatible with a removable back puck panel and elastic BNS cords on the shoulders straps Cell technology back protector that is highly ventilated and flexible Bionic Hydration Pack compatible