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The double ring system is the most secure of all locking systems hull. As such, this system is the most common in high-end helmets, especially sports, besides being the only approved for use in circuit. But it will not help if we buckled well.

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As you can see, the system consists of two metal rings linked to one of the tapes.

Tutorial: how to fasten a double D-ring helmet

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To fasten our correctly, we started another tape and go through the two rings.

Tutorial: how to fasten a double D-ring helmet

We can use the red strip to tighten the belt.

Tutorial: how to fasten a double D-ring helmet

We run the entire tape until it clicks and then we had the same tape by one of the rings and re-tighten.

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Tutorial: how to fasten a double D-ring helmet

To impede having the belt hanging, this system almost always has a push button.

Tutorial: how to fasten a double D-ring helmet