In France, wearing a safety helmet when skiing is not compulsory but only recommended. On French slopes, 73% of French skiers of all ages wear one against 88% of foreign skiers. Among children, the percentage rises to 97%, mostly due to the rules of skiing lessons. Reducing the risk of serious head trauma in 60% of cases, helmets must be approved under specific standards, replaced at each violent impact, and changed regularly to maintain their protective characteristics against UV rays.