i had one for a while and fitted nicely, can't remember which size i got tho. don't know if you've seen this?
Protec Sizing: Please measure the circumference of your head (horizontally from the middle of your forehead)
Small: - 53cm - 54cm Medium: - 55cm - 56cm Large: - 57cm - 58cm X Large - 59cm - 60cm.
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i had one for a while and fitted nicely, can't remember which size i got tho. don't know if you've seen this?
Protec Sizing: Please measure the circumference of your head (horizontally from the middle of your forehead)
Small: - 53cm - 54cm
Medium: - 55cm - 56cm
Large: - 57cm - 58cm
X Large - 59cm - 60cm.