The met manta aero road helmet features cutting edge aerodynamic design which has been proven in wind tunnel tests to save 10 watts at 50kmhr compared to other similar road helmets a saving that will make a difference if you are working on your speed whilst aero helmets can often get hot the clever positioning of the vents and the naca crown vent keep your head cool without increasing drag the manta features mets top of the line retention system safe t advance which provides the bes