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On those cold days outdoors, it's important to wear a breathable base layer that will keep you warm and balance your temperature. That's why we have developed the Trift line that features a Merino Wool/Polyamide blend. The wool content insulates and inhibits odors, the synthetic fibers make the shirt durable and ensure the material dries quickly. The seamless construction allows for a body-zone-specific arrangement of different material structures for optimal body temperature regulation. MAMMUT sources its Merino Wool from suppliers who care about animal welfare and are anti-muling.