Troy Lee Designs A1 - Allmountain helmet in race design.The A1's reinforced polycarbonate helmet shell with molded-in EPS liner extends over the sides and to the back of the head, providing ideal protection in the event of a fall. The adjustable visor is held and regulated by anodized aluminum screws. A retention system adjustable in three positions allows you to adjust to your individual fit. It can also be used to accommodate the wearing of goggles. The one-piece inner lining is removable and washable. Its antimicrobial, moisture-wicking material guarantees you a dry, comfortable feeling in the helmet even in hot weather. In addition, when the heat is on, the 8 intake and 8 exhaust vents allow air to flow through the helmet and noticeably cool your head. InmoldingInmolding refers to a technology used to optimize the weight, ventilation and stability of the helmet. The outer shell is bonded to the impact absorbing EPS material during the manufacturing process to form a single unit.