The 3M Combat Arms 4.1 earplug is itself the successor to the 3M impulse noise protection earplug. Like its predecessor, the Combat Arms 4.1 earplug has a microfilter, which closes in the event of impulse noise, as it does for shots or explosions, whilst ambient noise at normal volume is transmitted unfiltered. In addition, the Combat Arms 4.1 earplug, however, provides yet one further function: a small button allows the user to change to a closed, filter-less mode and thus be protected against uninterrupted noise. Flexible switching to the suitable mode: the little rocker button is ergonomically designed and can be easily operated in your ear, even with gloves on. In this way, the user will always jump to the mode, which the current situation requires. With a insulation value of 28 decibels when closed and 16 decibels in open mode, the 3M Combat Arms 4.1 earplug provides effective sound damping. Three sizes for an optimum fit. Intelligent ear protection is suitable for most ear passages. A soft and flexible texture ensures a comfortable fit. The Combat Arms 4.1 earplug is reusable, easy to clean and needs no batteries.