Scientists at the University of Zurich have developed a material that never gets wet.
The fabric is constructed of polyester fibers that are covered in a layer of 40-nanometer-wide silicone nanofilaments. These nanofilaments are spiky and cause water to sit in a sphere above the fabric, a permanent pocket of air protected safely below.The material even reduces drag in water by 20%! I have no idea what sort of implications that has, but I think it's something to do with waterproof sheets.
Nanotech Material Never Gets Wet, Even When Wet [gizmodo]