A. Gore-Tex fabric has become increasingly popular in recent years and is used in many high-quality athletic clothes and shoes. This being the case, you would think that this type of fabric would be great for a trail running shoe, but it turns out that not everyone is convinced. In fact, some running professionals believe that Gore-Tex is a terrible fabric to use on a trail shoe, mainly due to the fact that the water resistance nature sacrifices breathability in warmer climates. If you know that you’re going to be spending a lot of your time running in a location that is cold throughout the year, then a Gore-Tex trail running shoe should not be a problem. The shoe will still be rather breathable. On the other hand, if you know that you’re going to be spending your time running in a location that has a warmer climate, some running professionals believe that the fabric will make the shoe much less breathable. In this way, you’re sacrificing breathability for Gore-Tex’s water resistant elements, which may or may not be completely desirable.