The Patagonia Women’s R1 Thermal Jacket is a technical fleece midlayer designed for cold alpine environments where warmth, breathability, and mobility are essential. Part of Patagonia’s R1 series, the jacket is built for high-output mountain pursuits such as alpine climbing, ski touring, mountaineering, and winter hiking, where maintaining warmth while moving is critical. The jacket is constructed from Technostretch fleece made with 91% recycled polyester and 9% elastane, a fabric that combines durability with significant stretch. The smooth outer face helps resist abrasion and deflect light wind and snow, while the interior features a micro-grid fleece backing designed to trap warmth and wick moisture away from the skin during activity. This combination helps maintain insulation while allowing excess heat and moisture to escape during sustained movement. A full-length front zipper allows for easy ventilation during changing conditions or increased exertion. Offset shoulder seams reduce pressure points under backpack straps, improving comfort during long approaches or climbs. Stretch construction and articulated patterning allow unrestricted mobility when moving through technical terrain or while wearing additional layers. Storage is provided through a zippered chest pocket and two zippered handwarmer pockets designed to lie flat under a harness or backpack hip belt. With a slim performance fit and a weight of around 337 g, the R1 Thermal Jacket works effectively as a breathable midlayer under a shell or as a lightweight outer layer in dry, cold conditions.

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