Anti-puncture system dedicated to all motocross riders who want to tackle any track without the uncertainty of not completing their race or simply not having the inconvenience of a puncture during a training, also guaranteeing the same performance normally offered by an inner tube. Thanks to its high elasticity, it adapts to most of the tires availble in the market. The cross mousse reaches the highest levels of elasticity after only a few minutes of use, while at rest it resumes its initial hardness. At the end of use, it is advisable to leave the motorcycle at rest for a few minutes on a central trestle, to allow the mousse to resume the initial shape and hardness. The mousse is intended exclusively for off-road use, therefore it is not approved for public roads.