I use an old Iditarod trick I saw back in 09 of Jay Petervary,a veteran rider of the 1000 mi trip to Nome. In addition to wearing a balaclava, I cover my nose and cheeks with a fleece headband. This gives my breath an opening to escape without going up my goggles when covered with the balaclava. This is my 11th winter of daily commuting. I always had fogging problems below 10'f. I used it at 0'f and it worked great.