【Features】 ・Active insulation that solves the problem of "hot when moving, cold when still" ・PERTEX × POLARTEC Alpha provides excellent balance of breathability and warmth ・Not completely windproof, but therefore less prone to stuffiness and more comfortable ・Versatile for mountain climbing, running, cycling, and town use 【Detailed Explanation】 Appropriately breathable! The "breathing clothes" active insulation jacket Outer fabric / PERTEX QUANTUM AIR Insulation / POLARTEC Alpha "Hot when moving, cold when still" — this high-performance insulated blouson solves such problems. The key is the combination of highly breathable PERTEX QUANTUM AIR and POLARTEC Alpha, which combines breathability and heat retention. This achieves a structure that "actively releases" rising body temperature and moisture. However, it is not completely windproof like GORE-TEX, so it takes in outside air to a moderate degree. As a result, it is less likely to overheat and efficiently prevents stuffiness during exercise. This reversal of the idea, which promotes breathability before you even start to sweat, is the true value of this wear. Like wearing a fleece in the fall, the outside air and body temperature are in exquisite harmony, and you stay comfortable even when you keep moving. It's not too light, and it has a solid feel, but it's comfortable without feeling any stress, and it keeps the "just right temperature" in any scene, from mountain climbing, running, and biking to town use. It is the ideal active insulation, worthy of the name "breathing cold-weather gear."