I don't usually tout too many clothing companies on this rag, but what the hell, right? Campbellsville Apparel, located in Campbellsville, Kan-Tuck-Ee, is the largest supplier of undershirts and underwear briefs to the United States military services. (A picture of a soldier wearing one of the shirts was posted on A Continuous Lean a couple of days back.) The shirts are 100% moisture wicking polyester, cheap (3 for $12), have very short sleeves (the best part about them), fit extremely well, and for those of you who are attracted to the "100% American made from 100% American components" thing, they have that going for them as well. Great for walking up and down whatever trail it is you're walking up and down.Buy a pack here.