Columbia Titanium Womens Outdry Ex Diamond Tech Rain Jackets XS and SmallOutDry Extreme is the first ever waterproof and breathable fabric technology constructed with a waterproof layer on the outside and soft, wicking fabric inside. Traditional raingear uses interior waterproof membranes which don't allow for air flow, and water repellent coating that degrades over time. With OutDry Extreme, the rugged exterior is an incredibly water tight membrane with millions of microscopic perforations that let water vapor escape