When you're two days into a week long backpacking trip, you don't want to get caught in rainy weather only to discover that the shell you brought along is about as waterproof as a plastic bag. Well thanks to the Columbia Titanium Outdry Ex Reign Jacket you'll never have that problem. This versatile rain shell uses Columbia's OutDry Extreme waterproof system, which represents a stark departure from traditional shell construction. Rather than have the jacket's waterproof and breathable membrane fused to a synthetic outer fabric, the OutDry Extreme system places the membrane in direct contact with the elements, and puts a synthetic wicking fabric on the inside of the jacket. This eliminates the need for the DWR (Durable Water Repellent) on the outer fabric, in turn preventing the soaked feeling and reduced breathability that can often occur when a DWR fails. The result is a more breathable, more reliable, and more durable system. OutDry Extreme isn't the only thing to like about this jacket. It's got all the bells and whistles that'll help you thrive on the trail. An adjustable hood ensures that your head will stay as dry as the rest of you when you're caught in the rain, while zippered underarm vents let you expel heat when you need to really cool off in warm summer storms. An adjustable hem will keep wind from creeping up your jacket on exposed summits and steep slopes, while the full-zip design allows for extra venting and the ability to easily swap out under-layers.