In addition, you can download a PDF version of the Troxel Helmet Fit Guide to help you determine size which is available at the bottom of this page. Troxel helmets are certified to the ASTM F1163-04A standard. This means all Troxel helmets are ASTM/SEI certified which meets all USA organizations helmet certification standards.
Measurement size conversion from head size to XS to XL:
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