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Highway 21 .38 Retro Helmet Size Chart

Size Head (cm)
SM 55-56.5
MD 57-58.5
LG 59-60.5
XL 61-62.5
2XL 63-64.5

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

How to Measure

  • H Head
    Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, repeat for good measure and use the largest measurement.