I have had gravel and asphalt scrubbed out of road rash, a few times after crashing on a motrocycle and bicycle. And I dont think it is going to hurt any more because a little hair is in the way. Besides if it needs to be shaved after a crash. There is always a nice nurse at the hospital to do it. Or if I take care of it at home my lovely wife will do it. And to shave my arms and legs to stay cool? Maybe if you are as hairy as Robin Williams.LOL. I to cut my hair off in the summer I live in Ca. we've already had a few 100+ days. But the rest of the year it is pretty long, to keep me warm. But then to each his own.