Protective helmet

A protective helmet comprising:

• an impact-resistant shell adapted to substantially fully enclose the head of a user and including a chinpiece having upper and lower edges, said shell being formed with a window frontwardly of the location at which the face of a user would be disposed upon wearing of the helmet, with said upper edge of said chinpiece defining the lower boundary of said window;
• a visor mounted on said shell for closing said window;
• at least one air inlet opening formed in said chinpiece;
• and
• a shaped member in said shell lying along and rearwardly of said chinpiece, said member and said chinpiece being spaced from each other to define therebetween at least one upwardly open passage for air entering through said air inlet opening to flow along, said member having its frontwardly directed surface shaped to guide said air and direct it, upon leaving said passage, upwardly and substantially uniformly over the rearwardly directed surface of said visor over the full expanse of said window for inhibiting fogging of said visor.