The Arc'teryx Thorium Hoody W is ideal as a mid-layer on your alpine tours. If it does get colder, it fits easily under a hard shell jacket thanks to its close-fitting cut. Arc'teryx has used down composite mapping to make this light, minimalist jackets suitable for a wider range of weather conditions. It strategically combines down insulation with synthetic thermal fibers - precisely in the areas that are most exposed to moisture: Hood, collar, cuffs and underarm area. This means you stay warm even when it gets a little damp. There are plenty of bags with zips so you can store your items safely when you're out and about. The Thorium hoodie is the ideal companion for your alpine tours: light, warm and extremely comfortable to wear.