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CMHelmet SizesInchesHat Size
53S/M  20 7/86 5/8
5421 1/46 3/4
5521 5/86 7/8
56M/L227
57 22 3/87/18
5822 3/47 1/4
59L/XL23 1/47 3/8
60 23 5/87 1/2
61247 5/8