The Nike Women's Pro Warm Long Sleeve Training Top is another popular base layer top for women runners on Amazon. It is made with Nike's Pro Warm fabric, which provides a snug and warm feel without sacrificing breathability. The long sleeves offer extra coverage and protection against the elements. The slim fit design allows for easy layering and freedom of movement. Whether you're running in cold weather or hitting the gym, this base layer top is a reliable choice that combines style and functionality.