I have now used this helmet several times and it is perfect. I would say I have a smaller head, but I ordered a medium so that I could were a beanie under it for colder days. The size adjuster dial is perfect for days I don't want to wear a beanie and it still fits great. I also like that I can ventilate for hotter days. I like that the profile of the helmet is minimalistic and does not look/feel clunky. Great work Smith!