The Patagonia Men’s R1 Thermal Crew Shirt is a technical fleece midlayer designed for cold-weather mountain environments and high-output activities. Part of Patagonia’s R1 series, it emphasizes breathable warmth, moisture management, and mobility, making it suitable for pursuits such as alpine climbing, ski touring, winter hiking, and mountaineering. The shirt is constructed from Technostretch fleece composed of 91% recycled polyester and 9% elastane, which provides a combination of durability, stretch, and breathability. The fabric features a smooth, abrasion-resistant outer face that helps shed light wind and snow, while the interior uses a micro-grid fleece backing that traps warmth and efficiently wicks moisture during activity. This design allows the garment to retain insulation while preventing overheating during sustained movement. The crewneck silhouette offers a simple and streamlined design that layers easily beneath shell jackets or insulated outerwear. The stretch construction allows unrestricted movement during technical climbing or skiing, while low-profile cuffs provide flexibility and can be pushed up during intense activity. A zippered chest pocket offers secure storage for small essentials without adding significant bulk. With a weight of approximately 335 grams, the R1 Thermal Crew balances warmth and breathability in a relatively lightweight package. Manufactured in a Fair Trade Certified™ factory, it reflects Patagonia’s focus on durable performance apparel produced with responsible labor practices.

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