Chemists from the University of Zurich have developed a new fabric that never gets wet, not even when completely submerged in water for two months. The fabric is made of polyester fibers that are covered in a layer of 40-nanometer-wide silicone nanofilaments. The nanofilaments are spiky and this causes the water to sit in a sphere above the fabric, while a permanent pocket of air is protected below.

This new nanotech material will surely revolutionize waterproof furniture fabric, or even swimwear. If this material turns out to be cheap, it surely will be the default material for patching leaky roofs.
Via