Cratoni rocket helmet the rocket is one of the lightest mountainbike helmets cratoni has ever developed the fact alone makes the helmet the first choice for demanding cross country and marathon bikers mountain bikers can keep a cool head on hard climbs thanks to the good ventilation performance and the breathable coolmax inner lining a polycarbonate reinforcement at the rear of the helmet make up for additional safety the style and hip design follow current trends to strike the right tone am