Climbing rule #1: check your knots. Climbing rule #2: trust your partner. Climbing rule #3: wear the Arc'teryx Konseal 3/4-Zip Men's Fleece Hoodie when the weather's cold. Designed with vertical endeavors in mind, the Konseal is a trim-fitting Polartec Power Stretch jacket with durable and water-repellent Hardface technology that allows it to function as an outer layer for ice climbing or damp rock ascents, or an inner insulation piece when the temps go full-on arctic. Hardface is also smooth and tough, the better to resist rips and tears from rocks and ice tools. As you might expect, the Konseal has a secret: an integrated Phasic AR panel that nestles inside the hood and serves as a balaclava when the hood is raised, or as a neck gaiter if it isn't. Phasic wicks moisture and fights odor, so the panel won't turn soggy and stinky when you spend a day breathing into it, and provides light insulation so your mustache doesn't end up frozen to your lips. There are thumbholes to keep your sleeves where they belong, and a zippered chest pocket that stays accessible when you're wearing a harness or pack. If your climbing is likely to get cold, the Konseal is a surefire bet to keep you sending.