Z1R Jimmy Helmet European Collar the fit and finish of S1801MT 2XL the fit and finish of this glove feels broken in from the first wear—and only gets better with time Mesh lining with easy access panels for patches and embroideries Advanced abs polycarbonate alloy shell passes DOT standardsDual forehead vents are closable and direct air into the helmetComfortable brushed nylon interior with padded chinstrap3 snap removable bubble visor5 snap shell design will accept most face shields (not included)Spacious ear pockets for accepting speakers Z1R HELMET SIZING CHART SIZE HAT HEAD(CM) HEAD(IN) Medium 7 1 8 7 1 4 57 58 22 3 8 22 3 4 Large 7 3 8 7 1 2 59 60 23 1 8 23 1 2 X Large 7 5 8 7 3 4 61 62 24 24 3 8 2X Large 7 7 8 8 63 64 24 3 4 25 1 8