The Smartwool Women's NTS Mid 250 Base Layer Bottom is a highly rated option for women's cowgirl base layer bottoms on Amazon. Made from 100% Merino wool, these bottoms offer exceptional warmth and comfort. The fabric is naturally moisture-wicking and odor-resistant, making them perfect for all-day wear. The flatlock seams prevent chafing, while the wide waistband provides a secure fit. These base layer bottoms are also machine washable for easy care. Whether you're riding horses or engaging in outdoor activities, the Smartwool Women's NTS Mid 250 Base Layer Bottom is a durable and reliable choice.