100% waterproof. Let me say it again, 100% waterproof! This is by far the greatest, 100% waterproof hat you can get for any outdoor venture where you might expect rain, downpours, and the like. I wear glasses, and the brim on this Sombrero is wide enough to keep
even your glasses dry in the heaviest of rain storms. The back of the hat extends back far enough to keep
the rain from going down your back, hence, longer in the back then in the front and sides. You put this baby on and you will be dry, and stay dry thanks to the gore-tex crown, and the 100% waterproof brim!!! Bottom line, where ever you go and whatever your hobby (hiking, fishing, hunting, etc) if you want a lightweight hat that will keep
you dry all day and night, then this is your hat. Buy it and you thank me big time. Oh, by the way, you are quite welcome. One more thing, and this is very important, the inside of the brim has an adjustable Velcro strap, and my size is usually a 7 1/4 so I picked up a medium and it fits perfect after I made a slight tightening of the aforementioned strap. Cheers!