What Our Gearhead® Experts Are Saying: "This top has become one of my favorite base layers for alpine days. The wool blend breathes well, dries quickly, and never feels clammy, even on long approaches. I really like the seamless underarms—no chafing under a pack or harness—and the slim fit layers smoothly under shells." The Trilogy Wool Long-Sleeve Top is built for high-output mountain pursuits where comfort and performance can’t be compromised. Millet crafted this technical layer from a smart wool and polyester blend, giving us natural thermoregulation, moisture transfer, and quick-drying performance in one. Whether we’re climbing steep routes, skinning uphill, or pushing fast alpine missions, it keeps us dry and comfortable through changing conditions. A slim ACTIVE FIT ensures easy layering, while raglan sleeves and seamless underarms deliver mobility and next-to-skin comfort without irritation. Lightweight and breathable, this versatile piece moves with us in every season, making it a dependable choice for climbing, ski touring, and mountaineering alike.