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One K™ Helmet Size Chart

One K™ Helmet Size Chart

Small
53 - 54
6 5/8" - 6 3/4"
Medium
55 - 56
6 7/8" - 7"
Large
57 - 58
7 1/8" - 7 1/4"
X-Large
59 - 60
7 3/8" - 7 1/2"
 

If you have any questions about this product or a type of fit, please contact us at 1-800-365-1311 or service@sstack.com

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