The Milano Skull Cap is a thin thermal cap with a windproof membrane that is designed to be worn under your helmet. First and foremost, a skull cap has to be thin, elastic and not bunch under your helmet. The Milano uses high-tech, low volume fabrics and flat stitching to achieve this. The Capo Element-4 fabric prevents wind from penetrating while being breathable at the same time. Thermo Roubaix fleece adds thermal insulation. Several anatomic panels are sewn together to create the proper fit.