The Patagonia Women’s R1 Thermal Bottoms are technical fleece pants designed as an insulating midlayer for cold-weather mountain environments. Built for alpine activities and high-output movement, they combine breathable warmth with stretch mobility, making them suitable for pursuits such as ski touring, alpine climbing, winter hiking, and mountaineering. The bottoms are constructed from Technostretch fleece made with 91% recycled polyester and 9% elastane, creating a durable yet flexible fabric that moves naturally with the body. The material features a smooth, abrasion-resistant outer face that helps shed light wind and snow, while the interior uses a micro-grid fleece backing designed to trap warmth and wick moisture away from the skin during activity. The slim, articulated fit supports unrestricted movement in technical terrain. A low-profile waistband with an internal drawcord allows the pants to layer comfortably under shell pants or climbing harnesses without bulk. The tapered legs narrow toward the ankle to improve visibility of foot placement and make layering under mountaineering or ski shells easier. For practicality, the pants include two zippered hand pockets for securing small essentials during movement. With a lightweight design of approximately 295 g, the R1 Thermal Bottoms provide a balance of insulation, breathability, and packability for cold-weather mountain travel.

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