The helmet in the pic has a long lower section. Great for keeping UV off your neck, but likely adds to the fogging problem. Maybe get a shorter one or cut about 2” off the bottom.
If/when all else fails, I may just do that, depending on the helmets I see on the interwebs and how they are configured down there. After all, I can always put-on a neck protector/dickey of some sort each time I weld.
