Sizing guide for Champion Ventair helmet?

Awww men!! Surely 57cm in one hat is 57cm in another :confused: My sister has this hat in 58cm which is to big on me but it doesnt say the other sizing eg 7 1/4 etc
 
Champion hats are generous sizes im normally a 56 but have to get a 55 in a champion,

the ventair/evoution and ventair skull are all quite generous so I got mine properly fitted.
 
Awww men!! Surely 57cm in one hat is 57cm in another :confused: My sister has this hat in 58cm which is to big on me but it doesnt say the other sizing eg 7 1/4 etc

No it REALLY isn't. they are all different shapes, depths etcs. Even within the same makes models come up differently.

I'm trained to fit hats and I can PROMISE you this is the case. You really must have it fitted.
 
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