I think I went a size up despite measuring my head according to the instructions. I used to have long hair that I tucked/worn in and at the time the helmet fitted well. Now the hair is shorter and it may be too loose. The strap is stretched all the way down so it's a snug fit, but I think it can dangle a little in any wind resistance, which isn't very good. But received in perfect condition, comes with a protective case when not in use. good helmet
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