Our Women’s Koster 2.5-Layer Jacket is a lightweight rain jacket for active women, inspired by life on and off the water. We made it with Helly Tech® Performance technology for waterproof, windproof, and breathable protection. It packs into a small stuff sack, making it an essential for spring and summer day trips or far-flung travels. Plus, the front zipper is easy to repair, so you can rely on the jacket season after season.