under armour for Harley riders?

All harley motors, with the exception of the porsche designed VROD motor are air cooled. This means that the only thing cooling the motor is the wind generated by riding the bike. Unfortunately, the hot air cooling the motor is blown directly into the thighs of the rider. A few years ago harley "fixed" this by shutting down the rear cylinder when the bike is stationary. This will be the case for all harleys (except the vrod) due to the nature of being air cooled.

Wearing under armor may help a little, but you will not see a significant change until you get a bike with a modern cooling system. See Victory's oil/air cooled system, Honda, yamaha, and kawasaki's water cooled system, and Indian's oil/air cooled system.

Good luck and remember the gold bond!

really? one of my sleds has a 150 inch merch motor and it dont make to much heat. but then again it aint a dam bagger with fairings! wqork out a way to get more airflow over yourself and you will be ok. Cut some vents in those dam fairings! [that can be opened and closed]

Depends.

I'm afraid that you're not man enough for a big twin.