With this Men's Merino Sport 250 Colorblock 1/4 Zip, we've combined the breathability, odor control, and comfort of responsibly sourced Merino wool with the durability and quick-dry characteristics of polyester for a base layer top that can handle all of your active, cold-weather pursuits. Made to maximize warmth and induce sweat without getting you soaked, this first-layer top is ready to see how far you can really go.