Today’s waterproof running shoes are made mostly with a breathable waterproof fabric. An example of this fabric would be a material called Gore-Tex. But what exactly is this fabric and how does it function? Well that is what I will be going over in this article.
A waterproof breathable fabric is a membrane made up of millions of microscopic pores all packed tightly together. These pores are designed, size wise, in such way that they are small enough to prevent water from entering the membrane but large enough to allow water vapor molecules to escape out. So basically your body heat and perspiration are allowed to vent out as your level of intensity increases, while preventing outside elements such as rain and snow from entering your shoe.
There are is another material used that helps the membrane function correctly. An oil resistance material is integrated into the fabric to help protect the membrane. Over time oils from outside elements as well as oils produced by your body build up and can cause the membrane to function incorrectly. The oil resistance material aids in helping to prevent the the membrane from breaking down overtime.