Canon IS binos- "fog proof"?

Hi All: I am interested in getting a pair of Canon IS 15X50 binos. In the sales literature, it is stated that the lens is "fog proof". How is this so? I currently have a pair of 7X50's and condensation is always a problem.

Thanks,
Ivan

They mean resistance to internal fogging, not external. Internal fogging is what you get when you get condensation seeping into the internals of the optic.

Mike Swaim