When the alpine gets serious and the temperatures drop, the Patagonia R1 Thermal Full-Zip Hoody delivers the technical performance mountaineers demand. Built from stretchy Technostretch fleece with 91% recycled content, this alpine climbing essential moves with you through every reach, mantling move, and crampon placement while its microgrid backing traps warmth without the bulk. The smooth outer face sheds wind and light snow, while the low-profile hood fits perfectly under your climbing helmet – no bunching, no gaps, just reliable warmth when you're committed to the route. Whether you're tackling technical winter climbs or pushing through those brutal alpine starts, this fleece bridges the gap between base layer and shell, keeping you comfortable in the cold conditions where every degree matters.