You're about 90% sure your running partner will bail at the last minute, but your Arc'teryx Norvan Women's Jacket is more than ready to hit the trail. Throw this light, waterproof, and breathable shell on when you need serious protection from wet weather, but still plan on keeping your heart rate up. It's made with a 3-layer Gore-Tex shell and features Gore C-Knit backer technology, making it more breathable than standard Gore-Tex garments. Increasing the overall breathability of the Norvan are two Venturi-style underarm vents, which continually pull air through the jacket. The WaterTight center front zipper offers a highly water-resistant closure to the jacket, while reflective details keep you visible when you start your run before the sun is up.