... smooth feel, and shiny appearance, low water absorption, and excellent mildew and rot resistance. Flat Nylon: Flat nylon is best used ... water continuously because it absorbs water quickly, causing rot & mildew. It can also stretch up to 2% of its length ... excellent UV protection, high breaking strength, and resistance to rot & mildew. Along with Flat Nylon, Polyester has the wonderful smooth feel ...