I have a pair of ESS Profile Turbofan goggles that I use for riding in the rain. They have a small 2 speed fan built into the frame, and they don't fog under any conditions that I've ridden in. Pricey, but worth it to me.

http://www.esseyepro.com/Profile-Tur...53_detail.html

Cheers!

 

FOGTECH

http://www.motosolutions.com/fogtech.html

It's like magic! Seriously. I use this stuff pretty my daily during the winter/cold months.