I primarily use this for hiking when the temps are below freezing. By the end of the hikes, anywhere from 1-3 hours, the hat is soaking wet inside. I can't wear it in the car on the way home since it so wet and my head starts to get cold. I now use a Headsweats liner with this cap to keep my head drier than using the cap alone. This hat deserves 3.5 stars. Would recommend only if you don't sweat a lot.