Men's Mountain Light GORE-TEX® Triclimate 3-in-1 Jacket. It uses next-level two-layer GORE-TEX® fabric that is windproof, waterproof, and highly breathable. Then, there is the inner jacket filled with 550 responsibly sourced down. Wear them together for protection against wind, rain, snow, and cold - basically all types of winter mountain weather. For when it is mild but wet, use the GORE-TEX® shell on its own. When it is cool but dry, opt for the inner down jacket. You get two jackets, for three different climatic conditions without compromising on breathability.