Z1R Jimmy Helmet European Collar All cows are raised in We hate conformity All cows are raised in Texas Protection: Helps shield from sand 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