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Sweet Protection Helmet Size Chart

 
CM Helmet Sizes Inches Hat Size
53 S/M     20 7/8 6 5/8
54 21 1/4 6 3/4
55 21 5/8 6 7/8
56 M/L 22 7
57   22 3/8 7/18
58 22 3/4 7 1/4
59 L/XL 23 1/4 7 3/8
60   23 5/8 7 1/2
61 24 7 5/8