The Under Armour Women's ColdGear Authentic Mock is a top-rated base layer top for women's running on Amazon. It is designed to keep you warm and comfortable during cold weather runs. The top is made of a dual-layer fabric that has a brushed interior for added warmth and a smooth exterior for easy layering. It features the signature Moisture Transport System that wicks sweat away from your body, keeping you dry and light. The top also has anti-odor technology to prevent the growth of odor-causing microbes. With a fitted silhouette and a mock neck design, it provides a snug and stylish fit. Whether you're hitting the trails or running on the road, this base layer top is a great choice for women's running.