Thanks to its durable DryVent™ fabric, the Millerton Insulated Jacket is as breathable and waterproof as the popular Millerton Jacket. But there's a twist. Inside you'll find plenty of synthetic insulation to keep you warm even when it's damp. This insulation is lightweight and packable too, meaning you can stuff the jacket in a pack no problem. Bad weather setting in? Throw up the hood, adjust the hem, pull out that energy bar from the chest pocket and power on through.