By adjusting the proportion of merino wool in the base layer fabric, garments can be created for different uses. In these underwear, two-thirds of the fabric is quick-drying polyester, just under one-third is merino wool, and the final touch is elastanea great choice when you need base layer underwear thats both very warm and suitable for intense activity, where moisture-wicking is essential. We recommend these underwear for winter sports, from downhill skiing to long cross-country skiing sessions and winter trekking. The same manufacturer's Hot 6 Pack Turtleneck is the perfect pair for these pants. - Slim fit: narrow cut - Merino wool helps reduce odor and regulates temperature fluctuations - Machine washable: avoid using bleach and fabric softeners Like all of Scandinavian Outdoors merino wool products, these underwear are mulesing-free, meaning the painful mulesing method has not been used in the wool production process.