The Smartwool Women's Merino 250 Base Layer Bottoms are highly regarded for their warmth and comfort. These bottoms are made from 100% Merino wool, which is known for its natural insulation and moisture-wicking properties. The Merino 250 fabric provides excellent temperature regulation, keeping you warm in cold weather and cool in warm weather. These base layer bottoms are perfect for outdoor activities like skiing, snowboarding, or hiking, as well as everyday wear during the colder months.