Very tightly sized. The membrane which makes this a wind stopper is not stretchable at all, so the fit is way too tight. Get at least one size larger to wear a light shirt under it. If you want to use it as a top layer with a shirt and lighter sweater under it then you will probably need to go up two sizes.
I got this cap for my husband to wear during the hot, muggy days of summer. He needed the mesh backing to help keep his head cool. It is his new favorite cap! Being adjustable is a plus.
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