Helmet sizing

[Mckrs]

Hi all, first post here and it's regarding the sizing of helmets.

I was wondering If anyone had any idea as to how Mycro compares to oneills in regards sizing?

I own an oneills helmet in large whic is supposed to be 60cm, i had ordered a Mycro XL whic was apparently 59cm- but this was massive compared to the oneills and rattled  around whilst on.

Unfortunately I am not in a position yo try a Mycro in L before I order, so I was wondering If anyone here had any insights with regard to the sizing?

Cheers, M.

[Ash Smoker]

Make sure it is adjustable, whatever brand you pick.

[Dag Dog]

Has anyone tried any of these fake ones?    

https://www.rte.ie/sport/hurling/2023/1218/1422628-ccpc-and-gaa-issue-warning-over-counterfeit-helmets/