This is a long-sleeved shirt from the outdoor brand "mont-bell" with a half-zip design. Item Features: Design: A half-zip (zip shirt) style that allows for easy temperature adjustment inside the garment, with the brand logo on the chest. Functionality: Highly versatile design that can be used as an inner layer (underwear) for activities such as mountain climbing and skiing, as well as a standalone cut-and-sew shirt. Geoline: A standard underwear series that can be used year-round, with high quick-drying and heat-retention properties. Popular Model... Geoline Gender... Men's