Are full-shell helmets safer than half-shell helmets?

Full-shell helmets provide more coverage and are better at protecting against the specific hazards of racing (gate strikes, high-speed impacts, facial injuries). However, 'safer' depends on context. For racing, yes — they provide necessary protection. For recreational skiing, a well-fitted half-shell helmet with MIPS is the appropriate safety choice. Using a full-shell helmet recreationally may actually increase risk due to restricted vision and the temptation to ski without it because it's uncomfortable.