ORIGINAL: okcmco
I believe fogproof pertains to internal fogging. Like if moisture gets inside the the tubes, it can evaporate and the water vapour can cause the internal surfaces of the glass to fog.
Bushnell has a coating called rainguard that they use on thier scopes ans binoculars. This makes water bead up on the glass and significantly reduces external fogging such as what you were talking about.
okcmco
That's one of the main reasons I went to the 8X32 Bushnell Legends, their "RainGuard" lens coating as well as being waterproof. Nikon also makes some great glass. The European Models are way over priced in my opinon. When comparing them, the Bushnell Legends held their ground in the optic department!! Plus being almost $1,000.00 cheaper.