The Under Armour Women's ColdGear Authentic Mock Neck is a popular base layer top among women runners on Amazon. It is made with Under Armour's ColdGear fabric, which provides excellent warmth and moisture-wicking properties. The mock neck design offers extra coverage and protection against the cold. The compression fit provides a supportive feel and helps reduce muscle fatigue. The flatlock seams reduce chafing and irritation. Whether you're running in cold weather or engaging in outdoor activities, this base layer top offers both style and functionality.