This neck up features a zipper for a good fit and the ability to regulate temperature. This is the next step up from a neck gaiter that allows you to control your warmth. Product Features:Super soft Micro Fleece Neck-Up, Collar style zipper construction provides adjustability, Ideal for changing temperatures, Control your warmth, Thinner & softer than regular fleece, Wicks, warms, non pilling, durable, soft, Zip opening for greater comfort.