Thats strange i'm a 58cm head and ordered a M/L, it arrived today and i found it too tight so ive opted to return it. The price has gone up now to £12 or something so ive decided to go for something abit more unique, with this cap being on hotdeals you'll see more and more people wearing it. I'll be ordering L/XL next time though.
You're welcome. Having had a better look, feel & comparison with couple of other similar (but adjustable) caps I own, I think the main problem is that it's a bit 'shallow', which could be giving it the 'false' impression that it's not secure-enough & can easily come off or be knocked off. Your experience could differ. With free returns no matter how many you order, if too tight, return it & try the size up.
Thanks for letting me know,I shalll try the samller size
Received today, the smaller size is better so have decided to keep it & return the original. Don't think I'll be buying another non-adjustable cap again though, unless it is really special & inexpensive!