Pearl Izumi Thermal Skull CapPearl Izumi's Thermal Skull Cap keeps your dome warm in all conditions. The forehead panel is windproof, and the sides and rear provide excellent insulation and moisture wicking. P.R.O. Thermal Dry material maintains warmth while keeping you dry. Long hair and ponytails can be run through a port in the back, and reflective decals assure visibility.FeaturesKeeps you warm provides insulation and keeps you dry in frigid conditionsReflective logos make sure you're visibleRear port fits around long hair and ponytailsSize GuideOne Size | Pearl Izumi Thermal Skull Cap Men's in Black