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P23 Helmet Size Chart

Project.23 Helmet Size Guide

Size Guide XS Small Medium Large XL XXL
Inches 21.25-21.65 22-22.5 22.8-23.25 23.6-24 24.4-24.8 25.1-25.6
CM 54-55 56-57 58-59 60-61 62-63 64-65
Head shape can play a factor in helmet fit. So our size guide is designed a starting point and will work for most people.
If your head measurement falls in between sizes, it's advisable to go down a size. 
 Please contact us if you'd like more information on sizing. 
We offer a free (UK only) returns service if your helmet doesn't fit.
Head Measurement

 

How To Measure Your Head

Using a flexible tape, measure around the circumference of the widest part of the head, above the ears. 

Please refer to your actual measurement and don't rely on your existing helmet size. 

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