It's hard to find a more useful piece of outdoor gear than a good insulated jacket, and when that jacket also has the stretch and breathability you need on your most intensive cold-weather missions then all the better. Smartwool's Smartloft-X 60 Full-Zip Hooded Jacket is just that--a warm insulated jacket with the technical chops for hard-charging winter pursuits. It's made with a windproof and water-resistant face fabric that gives you protection against inclement weather when you're up in the mountains without a shell handy, while wool and synthetic insulation offers toasty warmth that breathes well during activity and won't lost its warmth if it gets a bit wet. There's also a lighter, stretchier insulation on the sides, underarms, and back yoke that boosts your breathability as you build heat and lends easier movement during chilly ski tours, climbing sessions, and day hikes. Merino lining helps wick moisture to keep you dry and comfortable as you navigate steep mountain terrain, and multiple pockets on the inside and out ensure that you've always got room for gear and other essentials for a day spent adventuring in the cold.