The 3M™ Peltor™ Optime™ 105 Earmuffs have been developed for effective hearing protection in the most demanding noise environments. The earmuffs feature added mass & volume, plus a unique “double shell” earcup design to boost the noise reduction throughout the full range of low & high frequencies. These cap-mounted earmuffs offer convenient, comfortable hearing protection that securely attaches to a hard hat for integrated head and ear safety.