What Our Gearhead® Experts Are Saying:"This is my go-to long sleeve for high-output activities. It’s ultra-light, wicks sweat better than anything else I own, and the merino blend keeps odor in check even after long days on the trail. Whether I’m running in cooler temps, layering for hikes, or just need something breathable, this shirt does it all."When we need a lightweight layer that keeps up with every season, the Featherlight Long Sleeve is our trusted choice. Made with icebreaker’s Cool-Lite™ fabric, this merino-TENCEL™ blend wicks moisture, dries quickly, and regulates temperature so we stay cool when moving fast and warm when slowing down. Offset shoulder seams prevent pack rub, and the slim fit ensures easy layering whether we’re on a multi-day trek or squeezing in a morning run. Naturally breathable and odor-resistant, this long sleeve keeps us feeling fresh no matter how far we go.