Work hard in cold conditions with the 5.11 Underhelmet Skull Cap. This lightweight cap is designed to be comfortably worn underneath a tactical helmet, keeping you warm, comfortable and protected when the temperature drops. Double-layer construction and enhanced cushioning keep your head protected during intense activities. Made from a blend of polyester and spandex, this hat uses jersey knit fabric and flat locked seams to ensure long-lasting durability. Improved compression characteristics keep the hat snug and secure on your head from the moment you put it on. Lightweight yet warm, this cap allows you to stay focused on the task at hand when working in the cold.