How do I know if a senior helmet fits properly?

A properly fitting helmet should be snug but not tight, with even pressure all around your head and no specific pressure points. When you shake your head vigorously, the helmet should move with your head, not shift independently. The front edge should sit just above your eyebrows (or goggles), with no gap between helmet and goggles. You should be able to fit one finger between the chin strap and your chin. Use the dial system to fine-tune the fit — it should feel secure but comfortable enough to wear for hours without noticing it.