My helmet size is Large.
I have several of those (open face) large helmets and all fit well from brand new.
I ordered a "Large" Z1R helmet and when it came I found that it was impossible to put it on my head Extremely tight!
I returned it and after a long, long time (wait) I was able to get an "Extra large".
This one was slightly better. I could barely put it around my head, but still quite tight.
I gave up. I got tired returning them and waiting for the next size up.
The helmet itself and padding is good quality, but the sizing is completely unrealistic!
Im in Canada, shipping was about 3 weeks to arrive. Ive previously only worn Shoei FF helmets. The outside of this helmet is quite large and feels heavy. The liner feels plush and comfortable, but overall feels a little "cheaper" than my Shoeis. There were no directions with it so it took a fair bit of fiddling around to consistently operate the chin/visor right - I could have watched an online video for help. As another reviewer noted there are no rear vents, which I find surprising because I really only want to ride with the chin down. So I feel that would be the most important thing to change would be to add better venting. Overall I think I like it, but Ive just got it so time will tell...CHEERS
Like the title says I haven't received this helmet yet. Be aware that an estimated shipping date can be not even close to the actual shipping date. Estimated 4 days, found out today it won't get to their warehouse until 14 days after placing the order. They did upgrade shipping which is about the least they could do. Will update review when I receive this helmet.