NBW Baselayer Long Sleeve Top Get the most out of your next workout with the New Balance W Baselayer Long Sleeve Top. Made from lightweight polyknit materials and featuring NB DRY technology, this women’s shirt is designed to help wick moisture away so you can stay cool and keep your focus on your workout. Versatile and stylish, this compression performance top is sure to become a favorite layering piece. 74% polyester, 26% spandex.