What Our Gearhead® Experts Are Saying: “The Fusion Grid Hoodie is my go-to midlayer for alpine missions. It’s warm but never stifling, thanks to Polartec Power Grid’s breathability. I love how easily the hood fits under a helmet, and the two-way zipper makes it super practical for layering with a harness on.” Designed for demanding mountain missions, the Millet Fusion Grid Hoodie is built to keep us warm, mobile, and dry through every ascent. Its Polartec® Power Grid™ fabric traps heat close to the body while efficiently wicking away moisture, creating a balance of warmth and breathability that’s perfect for high-output climbs. Despite its technical performance, it packs down easily, making it a staple in our layering system for fast-moving alpine objectives. Every detail of this hoodie is fine-tuned for the mountains. The balaclava-style hood slides seamlessly under a helmet, while raglan sleeves and seamless underarms eliminate chafing from backpack straps. Two high-set zippered pockets remain accessible with a harness, and the two-way zipper allows quick venting or layering flexibility. From early-morning approaches to summit pushes, the Fusion Grid Hoodie is a lightweight powerhouse we trust for warmth, movement, and comfort in alpine environments.