The Under Armour Women's ColdGear Authentic Mock is a top-rated base layer top for women's tennis on Amazon. It is made with Under Armour's ColdGear fabric, which keeps you warm and dry in cold weather conditions. The mock neck design offers extra coverage and protection against the elements. The top features a compression fit that supports your muscles and reduces fatigue during intense matches. With its top ratings and positive reviews, this base layer top is a popular choice among women tennis players who seek both comfort and performance.