Men's Long-sleeved Shirts

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Men's Long-Sleeved Shirts Your All-Season Performance Layer Long-sleeved shirts are the essential workhorse of the serious athlete's wardrobe. At Decathlon, our collection is engineered to serve as a protective top layer in summer or a high-performance thermal base layer in winter. Whether you're gaining elevation in the mountains or training for a marathon, our shirts provide the optimal balance of warmth, ventilation, and sun protection. Discover shirts built with advanced natural and synthetic fibers from our expert brands, Simond, and Kiprun. Technical Fabrics & Engineered Warmth Our long-sleeved shirts are categorized by their intended use and primary fabric technology: 1. Merino Wool (Forclaz & Simond: The Ultimate Base Layer) Ideal for backpacking, trekking, and mountaineering, our Merino wool shirts are designed to handle variable conditions and multi-day use: Thermoregulation: Merino wool naturally keeps you warm in the cold and helps cool you down in the heat, preventing the unpleasant "freezing effect" after intense sweating. Built-in Odor Control: The natural properties of wool limit perspiration odors, meaning you can wear the shirt for days on the trail, reducing pack weight. Durability Hybrids: Look for our Merino Resist blends, where the wool fiber is wrapped in polyamide thread. This construction significantly increases abrasion resistance and longevity against backpack straps and rigorous use. Advanced Ventilation: Features often include a half-zip collar (like the MT500 series) for quick ventilation when your body heat spikes during hikes . 2. Performance Synthetics (Kiprun & Quechua: Focus on Speed) Designed for high-output activities like running, cycling, and fitness, these shirts prioritize speed, breathability, and quick drying: Rapid Moisture Wicking: Synthetic polyester fabric quickly pulls sweat from the skin and diffuses it, guaranteeing quick-dry performance and preventing the shirt from becoming heavy or clammy. Thermal Comf