Bidirectional bezel watches
A bidirectional bezel is a bezel that can be adjusted both clockwise and counterclockwise. The term does not refer to the markings of the bezel, so it can be a dive bezel, 12-hour bezel, or any other type.
The opposite option is the unidirectional bezel that only allows adjustment in one direction. If you need to adjust the other way, you have to make a full circle. You can learn more about this bezel on the unidirectional page.
Bidirectional bezels are preferred in low-stakes scenarios where they are considered "safe." For the most part, they are not considered safe on dive watch bezels, as accidental movement in the wrong direction could instill a false sense of safety to the diver.
This safety argument is contradicted by the Tudor Pelagos FXD—developed in partnership with the French Navy's combat swimmers—who prefer a bidirectional bezel and do not consider it unsafe.
Bidirectional bezels can also be found on watches that feature a bezel locking mechanism, such as the Glycine Airman watches.
