What Our Gearhead(R) Experts Are Saying:"This merino thong is a must-have for active days. It's ultra-soft, breathable, and moisture-wicking, keeping me cool during long hikes and high-output adventures. Plus, the merino-TENCEL(TM) blend ensures I stay fresh and dry no matter how intense the day gets."Designed for those who push their limits in the mountains, the 150 Essential Thong Underwear provides all-day comfort without distraction. Made with a blend of temperature-regulating merino wool and moisture-wicking TENCEL(TM), this ultralight base layer ensures breathability and a soft next-to-skin feel. Whether we're charging uphill or layering up for a cold-weather adventure, this high-performance essential moves with us while keeping us dry and comfortable. The natural properties of merino wool help regulate body temperature, fight odor, and manage moisture, while a touch of LYCRA(R) ensures a secure, flexible fit. With a minimal design that doesn't sacrifice durability, the 150 Essential Thong is built for peak alpine performance.