The material weight of this hat is around 125 grams per square meter (g/m2) which is definitely thin. However, it doubles by about 2 1/2 inches, giving you about 250 gsm over your ears. I have similarly designed cotton hats that are about twice the weight but not as warm or comfortable. Even though I have a fairly large head, I can pull the bottom brim of my hat over my eyes to block out the light.
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