Usually the ear protection used just has a simple narrow channel. This is effective in attenuating loud sounds without impacting quieter sounds as much. The nam

Usually the ear protection used just has a simple narrow channel. This is effective in attenuating loud sounds without impacting quieter sounds as much. The name brand I'm most familiar with are the SureFire Sonic Defenders. They're in-ear, not very visible without the retention cord attached unless you're specifically looking for them.