Soft, breathable and naturally odor resistant, the ultrafine merino wool of the men's REI Co-op Merino 185 long-sleeve base layer top is beloved while sweating on the trail—and sleeping in the tent.

• Ultrafine 185 g merino wool offers a soft feel without any itchiness
• Made with 100% merino wool that naturally breathes, wicks away sweat, dries quickly and resists odors, making it an ideal multiday trip companion
• UPF 30 sun protection
• Flat seams and merrow stitch construction eliminate chafing
• Underarm gussets allow full range of movement
• Designed to hug the body for optimum performance
• Back length: 28 in.
• Weight: 8.2 oz. (size Large)
• Machine wash warm, gentle cycle, with wool wash product; do not twist or wring; remove promptly; do not bleach; tumble dry low; dry cleaning not recommended
• Field-tested on its own and as a base layer while hiking, running, rock climbing, cycling, skiing and camping in diverse climates across the U.S.