The Filson Men's Deer Island Jac-Shirt is a hybrid layer for in-between types of weather. A heavy shirt or a light jacket? It's basically both and really depends on your mood for the day. Throw it over a tee, use it as a jacket or utilize as a midlayer. The 100% brushed cotton twill fabric is soft, durable, and warming. Handwarmer pockets at the sides toast up the hands when you're out for a walk, while military-grade melamine buttons close up the front. FEATURES OF THE FILSON MEN'S DEER ISLAND JAC-SHIRT Button-close front, pocket flaps and adjustable cuffs Vertical handwarmer pockets at side-seams Side-slit at waist for freedom of motion Fabric Details: 100% Cotton