This is a new-with-tags Nike Therma-FIT top in size small, an unwanted Christmas present! From their website... "Designed for all the ways you move, the Nike Therma-FIT One Top is made with soft fleece that helps keep you warm to, from and during your workout. High-stretch fabric with sweat-wicking power flexes with every move while helping you stay dry." You can read more here... https://www.nike.com/t/therma-fit-one-womens-long-sleeve-1-2-zip-top-Rl2n46/DD4945-100