Replying to Fog between Goggle lens

Okay this has happened to a pair of a-frames, soldiers, and eg1s's.  I have terrible luck with goggles.  The same thing has happened each time, and I am tired of getting a new pair of more expensive goggles each year because I don't want them to fog, and then having them fog.  It happens when I walk from inside to outside, no matter if they are on my face or not.  It only happens after it has snowed, but moisture should not be getting in between the lens, and I cannot get rid of it.  Does anyone know how to stop this from happening or why it happens?  I got rid of the a-frames 2 years ago and got the soldiers, and then got the eg1s's last year.  Help please.  I could not find anything about this happening in teh searchbar.