I'm an avid hiker/backpacker/runner and tend to agree re Gore-Tex clothing, but I do like having it in footwear for hiking in wet areas. It very obviously doesn't breathe as well as advertised, and I'd never want to wear a GTX jacket or pants while working up a sweat, but on muddy 20+ mile hikes with friends whose breathable mesh trail runners got wet and stayed wet all day, my feet have always been in way better shape wearing GTX hiking shoes. For shorter, sweaty trail runs, though, I'd take the mesh over Gore-Tex all day.