The product is a men's XL long sleeve black midweight base layer shirt by L.L. Bean, designed with thumb holes for added comfort during activewear occasions. Made from a blended fabric of polyester and spandex, this pullover shirt features a crew neckline and a solid black color with the brand logo accent. It is suitable for winter, fall, and spring seasons, making it ideal for outdoor activities like cross training and running. Easy to care for with machine washable instructions, this shirt offers a casual style with athletic fit, perfect for sports enthusiasts looking for a quality and classic base layer top.