Originally Posted by
Fredo76
Wetting your hair and ears helps for a cool-down, just like wearing a hat helps for warming up. Up to half of heat loss is from the head.
I do this too. I also get a haircut before a long ride in hot conditions. Having a short hair helps. But leave a bit more hair at the top for protecting your scalp from sunlight.
Also wet my shirt as well. But what really gets me in hot conditions is poor hydration or inadequate fueling when I didn't bring enough electrolyte water and food on the ride.