The Columbia Women's Omni-Heat Base Layer Bottom is a top-rated choice for women's cowgirl base layer bottoms on Amazon. These bottoms feature Columbia's Omni-Heat thermal reflective technology, which reflects and retains body heat to keep you warm in cold conditions. The four-way stretch fabric allows for a comfortable and unrestricted fit. The flatlock seams reduce irritation, while the antimicrobial treatment helps to prevent odor buildup. These base layer bottoms are also equipped with an elastic waistband for a secure fit. Whether you're riding horses or engaging in outdoor activities, the Columbia Women's Omni-Heat Base Layer Bottom is a reliable choice for added warmth and comfort.