1.Check your present goggles' to see if there is a slider to open and close the air vent at the top of the frame. If there is just open it up all the way to vent moist air.
2.You can also periodically, as you see the goggles fogging, hold the goggles frame in both hands and pump them rapidly out and back (to and from your face). This pumps cold air in and condensation out. It's a ski racer's trick that they often do before a run to insure clear goggles.
3. Or... you can try a new pair of goggles that have better (but adjustable) venting. (Yeah, I know, 'spensive.)
4.Try to use Cat Crap and other fog proofing material only on the outside B/C most good goggles have a proprietary anti-fog coating on the inside. Cat Crap will screw it up. Always wipe the inside ONLY with soft cloth, never Kneenix type tissue unless absolutly necessary. And then wipe very gently.
If there is freezing rain/wet snow icing up the outside of your goggles then Cat Crap wil definitely help a lot. It keeps the ice droplets from sticking to the plastic lens. Again, wipe them off only with a soft cloth, not your gloves.
5. Oh, yeah, if you wear glasses, as I do, you need to use Cat Crap on them when wearing goggles.