Details: Whether worn alone on warm-weather hikes or as a next-to-skin layer for frigid days at the ski resort, the 175 Everyday Long Sleeve Crewe is a versatile year-round baselayer made with our 100% merino wool rib-knit fabric. With a flattering slim fit, and all-natural breathability and odor-resistance, this do-it-all top is perfect for any active adventure.