Versatility and efficiency are Arc'teryx hallmarks, ones exemplified by the Men's Delta LT Zip-Neck Top. This Polartec Classic 100 fleece top provides essential thermal regulation throughout the year, minimizing gear needs and maximizing pack space. Wear it over a wicking shirt for cool evening runs, as a mid-layer for high-output winter pursuits, or as a lightweight baselayer in the frigid cold. Its smooth face won't catch or bind under outer layers, so you get more out of your shirt.