What Our Gearhead(R) Experts Are Saying: "This thing lives in my pack year-round. It's insanely light, and the 1000-fill down offers real warmth when I stop moving. The helmet-compatible hood is perfect for alpine starts, and it packs down to almost nothing. I don't leave basecamp without it."The Black Diamond Deploy Down 0. 5 Full Zip Hooded Jacket is the kind of layer we rely on. Built for climbers, alpinists, and fast-and-light mountain missions, this jacket provides critical warmth when weight and space are at a premium. Whether we're belaying on a windswept ledge or catching our breath during an alpine push, the Deploy is our go-to insulator that disappears in our pack until we need it most. Weighing just 160 grams, this slim-fit layer is built with ultralight 4D ripstop nylon and filled with 1000-fill traceable goose down for unmatched warmth-to-weight performance. It features a helmet-compatible hood for alpine use, a full-zip design for quick layering, and an internal stow pocket with a carabiner loop so we can clip it and go.