Wet Weather

Skin is already a waterproof barrier. It's also breathable.

Yeh, skin is waterproof. That doesn't stop you getting cold when it's wet though does it? And by breathable I guess you mean you sweat through it; you certainly don't *breath *through it.
A little learning is a dangerous thing.

I think your both missing the important point that you dont really sweat through your shins. And as were talking about them in an exposed situation, they get ample cooling too.