I wear it while cross country skiing. I live in Yellowknife, Northwest Territories, Canada. I often have little choice but to get out -35 degree Celsius (-31°F) weather. When the wind is blowing, and I am descending hills, it can create a breeze that has previously almost frozen my private parts. In the attached picture, I am skiing in the Frostbite 55 (recently changed from 'Frosbite 50') in Yellowknife. It is a 55 kilometer ski race around our small city. Polarjock is pretty much perfect. I love the fleece lining. I used to wear it under my long underwear. Now, I wear it on top of my long underwear, so I don't need to wash it as often.
Seth W. — Yellowknife, Canada