Cause that's the only explaination I have for the excitement I have towards my underwear. I'd say 90% of my wardrobe cost less than one pair of these, but I must say it is money well spent. Up to 10 days with one pair and no washing while working in the desert, no problems. 6 days with this current pair and everything is dry and clean. http://www.rei.com/product/694431?vcat=REI_SEARCH As good as icecream-stuffed-doughnuts!