Mountaineering and climbing are alpine activities in rapidly changing conditions. These moisture-wicking and breathable baselayer underpants are well suited for such high-performance activities. Inspired by and named after Monte Zebrù in the Ortles Alps and made in Italy, Salewa's Zebru Fresh body-mapping baselayers are made primarily from superfine merino wool blended with durable Tencel Lyocell from sustainably grown wood. The merino wool allows you to enjoy optimal thermal insulation and soft, next-to-skin comfort, while Lyocell provides additional moisture absorption and freshness. In addition, this underwear features smart synthetic polyamide fibers enriched with a blend of natural thermoreactive minerals. These Responsive yarns are able to absorb energy from your body and slowly release it back to your muscle tissue over time. The resulting increased blood flow, cellular performance and oxygenation leads to more effective thermoregulation and faster recovery. Responsive is an integral part of the fabric and does not wash out. This women's brief has a comfortable, body-hugging fit with 3% spandex for added stretch. It is made with an advanced knitting process that allows us to either use comfortable flatlock seams or eliminate seams altogether. Thanks to the high percentage of merino wool, our Zebru underwear also naturally counteracts odor. A fine, lightweight, technical Merino-Tencel baselayer brief for all-day freshness.