The endura thermolite skullcap has been constructed from the excellent thermolite material for excellent insulation throughout the wintry months it utilises hollow core fibres to create a warm layer of insulating air and it39s also fast wicking to quickly dissipate any sweat the super snug close fitting makes it convenient to wear underneath your helmet with high comfort so you don39t have to compromise your safety to keep your head warm when you39re riding this cycling skullc