Questions & Answers about Indosso il casco quando vado in bicicletta.
• Indossare literally means “to put on” or “to wear” clothing and accessories. It emphasizes the act of donning or having something on your body.
• Portare can also mean “to wear,” but it’s more general (“to carry” or “to bear”) and often used with glasses (portare gli occhiali) or jewelry. For helmets, jackets and most garments, Italians prefer indossare.
• In Italian, when talking about wearing clothes or gear in general, you normally use the definite article (il, la, etc.).
• Casco is a masculine singular noun, so its definite article is il.
• You would use un casco if you mean “a helmet” in the sense of “one among many” (e.g. “Ho comprato un casco nuovo”).