Troy lee designs a1 helmet drone whitethe a1 helmet is a lightweight fully encapsulated all mountain helmet that utilises maximum coverage and dimension to keep you safe and protected in all riding conditions whether youre charging single track riding dirt jumps or grinding on the xc bike the a1 helmet offers the premium fit and protection featuresreinforced polycarbonate shell in moulded with the eps liner extends down the sides and back of the head for maximum protection and durability