SureFire EP4 Sonic Defenders Plus was designed for those with larger ear canals and provides maximum hearing protection from dangerous noise levels, while allowing you to still hear safe ambient sounds. This allows you to maintain situational awareness to hear important conversations or demands. They feature EarLock outer rings which lock the earplugs in place using seven unique grab points. The low profile design allows for them to be worn under a hat, helmet, mask, headset, or supplemental muffs. They can also be worn while using the phone. Fits larger ear canals