Smartwool Women's Merino 250 Base Layer Bottom is a top-rated choice for women's flannel base layer bottoms. These bottoms are made from 100% Merino wool, which provides excellent insulation and moisture-wicking properties. The fabric is soft, breathable, and naturally odor-resistant. The bottoms have a mid-weight thickness, making them suitable for cold weather activities. Whether you're skiing, snowboarding, or hiking, these base layer bottoms will keep you warm and comfortable throughout your outdoor adventures.