The Patagonia Men’s R1 Thermal Jacket is a technical fleece midlayer designed for cold alpine environments where breathability, mobility, and insulation 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, offering a combination of durability, stretch, and moisture management. The outer face is smooth and abrasion-resistant, helping shed wind and light snow, while the interior uses a micro-grid fleece backing that traps warmth and efficiently wicks moisture away from the skin during activity. This structure allows the jacket to retain insulation while remaining breathable during sustained movement. The full-zip design allows for adjustable ventilation during changing weather conditions or increased exertion. Offset shoulder seams improve comfort when wearing a backpack by reducing pressure points under shoulder straps. Stretch construction and articulated patterning help the jacket move naturally with the body during technical climbing or skiing. Practical storage is provided through a zippered chest pocket and two low-profile handwarmer pockets designed to lie flat under a climbing harness or backpack hip belt. With a slim, performance-oriented fit and a weight of around 411 g, the R1 Thermal Jacket works well as a breathable midlayer under a shell or as a lightweight outer layer in dry conditions.

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