Once the thermostats dip and the frost settles in, there's not much the Mammut Broad Peak IN Hooded Jacket isn't good for. From casual strolls around town to the most adventurous mountaineering endeavors, this jacket will keep you warm through all of it. The 800-fill down insulation ensures high-quality, dependable warmth that's also lightweight and super packable. The body of the jacket is constructed with lightweight Pertex Quantum fabric for windproof and water-repellent protection from the elements. This fabric is also designed with Pertex Y Fuse technology to increase the downproofing of the jacket and to help water bead off more effectively, ensuring that it won't soak the insulation. The elastic hood offers a snug fit that works perfectly under a helmet, and when you're really trying to seal out the elements you adjust the hem easily with one hand to keep your warmth inside. Your hand and chest pockets are accessible when you've got a pack or harness on, and when you start to heat up or reach the end of your adventure you can stuff the jacket into its own side pocket and toss it back into your pack.