Believe the sizing
Reviewed by Travelin' Gal from Kansas on Sunday, October 2, 2016
This is a great product, if they have it in your size. I am a 5'2" woman who wears smaller hats/helmets. This fit me perfectly in the Sm/M that was available. Great airflow for breathing and didn't cause my glasses to fog up as badly as some other designs. But it is SMALL, and the fabric does not lend itself to stretching. So don't get this thinking you can "make it work" unless you actually have a small head.