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Principal 950 Modular Helmet Sizing

Size Head (cm) Hat Size
SM 55-56 6 7/8-7
MD 57-58 7 1/8-7 1/4
LG 59-60 7 3/8-7 1/2
XL 61-62 7 5/8-7 3/4
2XL 63-64 7 7/8-8

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.