For those looking for a natural and high-performance base layer bottom, the Smartwool Women's Merino 250 Base Layer Bottoms are a top-rated option on Amazon. These bottoms are made with 100% Merino wool, which provides excellent insulation, moisture-wicking properties, and odor resistance. The fabric is also soft and comfortable against the skin, making it ideal for all-day wear. The wide waistband and flatlock seams ensure a secure and chafe-free fit. Whether you're skiing, hiking, or simply staying active in cold weather, these base layer bottoms will keep you warm and comfortable.