You know it is cold when the local ski resort is telling its twitter followers to wear a ColdAvenger. Whitefish Mountain Resort yesterday reported a temperature, without windchill, at -10.9 degrees, and yesterday was even colder–with the howling winds plummeting temperatures to 50 below. This is perfect for a ColdAvenger. The mountain reported yesterday that 375 brave souls were on the slopes; some of them more equipped for cold than others. Dr. John Sullivan Jr., creator of the ColdAvenger, was one of those well-prepared skiers yesterday, and is back up on the slopes of Whitefish Mountain Resort today! He even had time to get the snow reporters a few masks so they could safely brave the wintery conditions and protect their faces, airways and lungs from the damaging impacts of the cold.