Replying to Goggles Fogging.

I know this has probably been talked about before but I did a search and didn't find anything. I was in Winter Park this week and on the 3rd day it got down to well below zero with strong winds and a ton of snow coming down. My goggles kept fogging and freezing and I couldn't take them off so I was basically skiing blind which nearly ruined a really good powder day. I've never really had this problem before. Do I need new goggles or what?