Rather than using a traditional pop-in/pop-out mechanism, MARK™ allows the ear cups to be pulled away from the ears and rotated backwards for stowage. Given the variance in head shapes and sizes, eliminating the pop-in/pop-out mechanism yields a tighter seal for the ear cups, resulting in a higher Noise Reduction Rating (NRR).

MARK™ is compatible with most major helmet rail types for attachment of many popular electronic hearing protection. It comes with all hardware for Ops-Core® ARC rails (and similar), Team Wendy® EXFIL® rail systems or Busch PROtective® rail systems. M-LOK® adapters are sold separately. Models are not interchangeable.

MARK™ specifically makes Ops-Core® AMP® headsets accessible for those who prefer to attach their ear cups to the top portion of the rail, or for helmets without rear rails, such as the Crye Precision™ AirFrame™.