Clear plastic masks turn yellow after a few years due to UV rays. They look terrible and once they turn colors its very difficult to remove them. I own a body shop and would only recommend clear if your car is garage kept.Oh please no....don't be talking about one of those damn black bras or one of those spaceship-looking plastic guards.
If you want real protection (that won't hurt the paint as much as it protects), look into a clear bra. Many of us have them.