It does the job, but looks a bit silly
Reviewed by Shrimpman from British Columbia on Saturday, February 2, 2013
Sierra must have tweeked the sizing recommendations, or I mis-read them, because I ordered the large for my 7 3/8 melon, and it is definitely too large. It stays put on my head, but the peak of the cap is not rounded as it appears in the picture, but quite tall and ridged. It looks really goofy!