Although it may be dressed up as a standard hoodie, don't be fooled by the Icebreaker Men's Quantum Hooded Full-Zip Shirt's seemingly casual disposition. Underneath its sleekly styled exterior is a wealth of wondrous warmth and moisture-wicking comfort, courtesy of its body-mapped merino wool optimizing heat retention and breathability in frigid alpine environments. What makes the Quantum Hooded Full-Zip Shirt superior to your average baselayer lies in Icebreaker's BodyfitZONE merino wool. This technology places midweight merino along the body to lock in warmth and actively wick moisture as you start to sweat. It's supplemented with ventilated merino zones that expel moisture in sweat-prone areas, so you're not a wet mess after you've been pushing uphill at an unrelenting pace.