I took mine for a test run last night (went jogging in them). The only con to wearing these that I found, is that they are slightly more bulky at the seams than regular underwear, so where they are fine under jeans, I had definite panty lines under my tighter fitting jogging pants. I think i'll work up a pattern for a more "boy short" style, using the original seams, and that should eliminate than problem. The pros? There is no sweat smell on my wool underwear (or even on the synthetic jogging pants I wore over them), that is usually on my clothes after I run (I can't believe I am telling you all this!), there was no unpleasant dampness from sweat while I ran, I was the perfect temp (neither hot or cold) in that region while I ran, and they are really cute looking! Of course these can be worn for everyday underwear too. I would imagine these would be fantastic for any mom that has to sit in cold bleachers!