Whether you're logging miles on those crisp early-evening runs or gearing up for cool-weather adventures, the Smartwool Active Ultralite Long Sleeve delivers the perfect blend of performance and comfort. This ultralight men's merino wool base layer features a premium blend of ZQ-certified Merino wool and TENCEL™ Lyocell fibers that keeps you cool as your intensity ramps up, while naturally managing moisture and resisting odors mile after mile. The athletic fit moves with your body thanks to strategically placed offset seams that eliminate chafing, and reflective elements ensure you stay visible during those dawn-to-dusk training sessions. From standalone wear on moderate days to your go-to base layer when the temperature drops, this versatile piece adapts to whatever your outdoor pursuits demand.
