I have heard the science but really just needed to see how it really works.  This stuff is great.  I now have several of these products and would not normally right about underwear but this is worth it.  I have used it whitewater rafting, hunting, walking and just plain sitting in a deer blind for days.  The first surprise I had was how comfortable it is. This is not itchy at all. During and after exertion I noticed a lack of clamminess and an extremely quick dry. I even wore a pair of boxers in 80 degree heat on a 2 hour horseback ride just to see how hot and uncomfortable it would get.  I was wrong.  It was more comfortable and dryer then cotton.  I have used it in all hunting seasons and it is not wearing out.  I wore it in the most clammy experience of duck hunting with heavy neoporenes.  I fell asleep in the blind much faster then usual because of the comfort. I could go on but look forward to the near zero weather more now for winter activities. I wish I knew about this stuff earlier.  If you need an idea for Christmas gifts or just plain want to keep you outdoor experience as enjoyable as possible buy it!

Phil A