Putting on a motorcycle helmet for the first time can be a confusing proposition, considering that most helmets are equipped with a puzzling amount of straps and buckles. What truly puzzles these new riders is the curious set of D-shaped metal rings sewn into one of the chin straps. Luckily, using the D-rings on the chin strap is simple enough that, with practice, you'll even be able to fasten your helmet with one hand.
Slip the chinstrap through both D-rings and pull to tighten the helmet securely onto your head.
Fold the chin strap over the first D-ring and pass it under the second D-ring. Pull the chin strap to tighten it against the D-rings. The chin strap should now be held securely between the D-rings.
Fold the loose end of the chin strap over both D-rings and attach it to the snap button on the opposite strap.
Practice lacing your chin strap with your helmet in front of you. Once you have the basic technique, practice again with the helmet on your head. If necessary, practice in front of a mirror until you are comfortable with the process. Check your chin strap often to ensure that it hasn't been loosened by the wind or vibration.
Do not fasten the chin strap loosely. It must be tightly fastened to provide the maximum protection possible.