The Men's Merino Quantum III Long Sleeve Zip Hoodie by Icebreaker is a slim fitting mi-layer that's ideal for skiing, hiking and any other technical mountain adventures. The Quantum III Long Sleeve Zip Hoodie will help regulate your body's temperature. This product is made with 100% pure merino fibers that were hand-picked for strength and softness to create a luxurious fabric that naturally breathes and resists odors.