Whether you’re moving fast over challenging terrain or tackling treks where pack space is at a premium, you need a super stashable shell that will keep you dry in a sudden shower. Crafted from ultralight, 2.5-layer Pertex® Shield Diamond Fuse fabric, the Phantom Mountain Jacket has a weightless feel that won’t burden your pack, while offering the sturdy waterproof protection you need in unpredictable mountain weather. The Diamond Fuse technology uses yarns with diamond-shaped filaments to create a tough, abrasion-resistant fabric, ensuring the jacket withstands long distances being carried in your backpack. This balance of durability and effortless packability makes it the ultimate shell to keep stashed in your pack year-round, ready for thru-hikes, scrambles, and hut-to-hut treks.