Not to "rain" on their parade (heh), but the ability to pass water vapor effectively while also remaining hydrophobic for water droplets, and doing that for a long time on surfaces that are exposed to constant wear, is sort of the holy grail of the outdoor gear industry. The company's page for their product ( http://www.neverwet.com/product-characteristics.php ) doesn't mention breathability. Considering that breatha…
Right. This product is just silicone. Thousands of similar products are already on the market. RainX is silicone. Boot/gear spray is silicone. It's not terribly durable with heavy use (clothing, etc) and it's not very breathable. But it does shed water!