The adidas Women's Techfit Base Long Sleeve Top is a top choice for women's tennis base layer. It is made with adidas' Techfit fabric that provides a compression fit for muscle support and improved performance. The long sleeves offer extra coverage and protection from the sun. The moisture-wicking technology keeps you dry and comfortable during intense matches. This base layer top also features a UPF 50+ rating for added sun protection. With its sleek design and high-performance features, it's no surprise that it is one of the most wished for women's tennis base layer tops on Amazon.