For running, especially long distances, some fabrics are better than others. And some are just a bad idea... So, out of curiosity, I googled "underwear running". This is one of the pages that came up:
http://www.roadrunnersports.com/rrs/womensapparel/womensbaselayers/womensbaselayerbottoms/list/?_requestid=51548 but worse than that... this is one of the options:
Women's Moving Comfort Seamless Thong
Item # MCW105
Reg: $15.00
VIP: $13.50
Average Rating: 5 out of 5 stars This item ships direct from the manufacturer.
You'll love the comfort of the Moving Comfort Seamless Thong. You'll get the best in moisture management, breathability and quick-drying comfort.
And "Sarah's" review: Sarah rated this product 5 stars
Thu, March 22,2007:
I love these. They are very comfortable and make me feel so sexy.