Windshorts for mid-intensive training and stop 'n' go activites for when it's really cold and the windchill is a factor to count in. Soft inside of fleece gives warmth and comfort while a flat outside optimizes motion.
Great pair of underwear! I wear mine all the time when its cold here in Sweden, and it's cold here many months during the year.
I never have to worry about getting my precious things too cold or windchilled thanks to the windstopper in the front. They are also very soft and thick and thus really nice to be wearing when it's cold!