Climbing rule #1: check your knots. Climbing rule #2: trust your partner. Climbing rule #3: wear the Arc'teryx Konseal 1/2-Zip Men's Fleece Pullover 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. Thumbholes keep your sleeves where they belong, and the zippered chest pocket 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.