2:32PM The best anti-fogging tip I've seen so far is to use a hairdryer on your lens before using the gear VR. Don't have it too hot, just a medium heat and wave it along the front and back of the lens for just a few minutes. Then hey presto! No fogging as the lens have been mildly heated
Any way to heat up the lenses removes the fog. Its a cold lens combined with a warm face that makes water in the air condense on the lense. As soon as the lense heat up enough, there no more fog. So all ways to preheat the GearVR housing fix the problem.