icebreaker has the world’s best merino wool layering system. Our base layers are made with superfine merino wool, sourced from our growers in New Zealand. Naturally breathable and moisture-managing, merino wool moves sweat away from your skin so you can stay dry and comfortable no matter the conditions. Designed for versatility, these base layers offer lightweight insulation without bulk. Wear them as thermals for warmth in the most extreme cold or under winter clothes for everyday coziness. Merino naturally regulates body temperature in both hot and cold weather, making it just as essential for summer summit pushes as it is for deep-winter adventures. The odor-resistant properties mean you can go longer between washes, staying fresh after a multi-day hike, a long travel day, or a tough gym session. Layer merino wool leggings and tops for cool-weather hikes, mountain training, and snow sports, or with shorts for autumn and spring cycling and running. These base layers fit seamlessly under any outfit, providing the warmth, breathability, and performance needed to take on any challenge.