The Under Armour Women's ColdGear Armour Compression Mock is a top choice for women's tennis base layer. It is designed to keep you warm and comfortable during cold weather matches. The compression fit provides a locked-in feel and supports your muscles for improved performance. The ColdGear fabric technology traps heat and wicks away sweat to keep you dry and cozy. With a mock neck design, it offers extra coverage and protection against the elements. This base layer top is highly rated and loved by many tennis players for its quality and functionality.