Trouble is, some of the ingredients in sunscreen may be bad for you per an article I just read on MSN.com. I went back for the article but it was not there anymore.
Another thought for those of us prone to sweating. Bailey's offers goggles with fine metal mesh lenses. They breathe nicely and won't fog in winter or summer since there is no lens. The have a cheap plastic type for about $10 and a much nicer Bugz Eye model with foam lining for around $20.