Product details:

It offers waterproof/breathable performance and a packable design to make it ideal for everything from treks in unpredictable weather to errands around town on a rainy day. The NanoPro fabric provides complete protection from the elements while still allowing heat and moisture vapor to escape, keeping you from getting soaked with sweat when you're slogging your way up a hill. And if you're still feeling too warm, open up the zippered underarm vents for instant relief.