The X-BIONIC Symbio Merino long sleeve base layer in Opal Black is a high-performance base layer designed for men. Made with a blend of merino wool and synthetic materials, this base layer offers the perfect balance of insulation and moisture management. The merino wool composition provides natural warmth and odor resistance, while the synthetic fibers help wick away sweat and ensure quick drying. The seamless construction and ergonomic fit provide maximum comfort and flexibility for any activity. Whether you're hitting the slopes or going for a winter run, the X-BIONIC Symbio Merino base layer will keep you warm and dry in style. Compare prices from: X-bionic in Men's Underwear