Motorbike Helmets with Micrometric Fasteners
Micrometric fasteners (sometimes called micometric or ratchet fasteners) are probably the most popular way to fasten a modern crash helmet. They’re dead easy to tighten up and, importantly, just as easy to unfasten. Just make sure you adjust the strap adjuster on yours from time to time to ensure it stays a nice and tight fit. See here for more information on micrometric helmet fasteners.
If you’re looking to buy a new helmet and want one with a micrometric fastener, then you might want to check out these helmets – because they’ve all got one.