What Our Gearhead(R) Experts Are Saying: "This long sleeve has been in my kit for years. It's breathable on ski tours, warm under a shell, and doesn't hold stink like synthetics. The 19-micron wool feels amazing against the skin, and it holds up after heavy use."When our adventures start before sunrise and end after the last lift, we count on the Ortovox 185 Rock'N'Wool Long Sleeve to keep us dry, warm, and comfortable every step of the way. Made with 100% fine Tasmanian merino wool, this versatile baselayer regulates body temperature, wicks away moisture, and resists odor during multi-day hut tours and summit pushes. The soft 19-micron wool feels ultra-comfortable whether we're skinning uphill or cozying up in a mountain hut.