Improved protection system for vehicles

A protection system for vehicles (12) comprising a waterproof and breathable covering cloth (10) sewn into a bag (11), made of a waterproof material as well; the bag (11) carries a side clamp (14) connected to a support member (15) for fixing to the vehicle body (12), so that when the vehicle (12) is covered, the cloth (10) does not lose its bag (11) and does not slip on the body. In this way, the operations for covering the vehicle (12) and removing the protective cloth (10) are made easier.