What Our Gearhead® Experts Are Saying:"This base layer quickly became my go-to for shoulder season hikes and long ski tours. The Intraknit tech really does a great job of regulating heat without overheating, and the mapped insulation keeps warmth where I want it. Plus, it’s one of the most comfortable layers I’ve worn under a shell—no bulk or bunching."When we're heading out for big miles in shifting temps, the Intraknit All-Season Merino Base Layer Crew is what we pull on first. Smartly designed using a performance-driven blend of Merino wool, TENCEL™ Lyocell, polyester, and nylon, this crew delivers next-to-skin comfort with exceptional thermoregulation and stretch. The real magic lies in the Intraknit™ technology. With targeted zones for warmth, breathability, and flexibility seamlessly integrated into the fabric, there's no need for added seams or bulk. The result? A distraction-free fit that moves with us, insulates in the right places, and keeps airflow dialed in where we heat up the most. Whether we're layering up for alpine objectives or cool-weather trail runs, this layer adapts to the demands of the day.