3M™ H10A PELTOR Optime 105 Over-the-Head Earmuffs3M PELTOR Optime 105 Earmuffs H10A The Peltor H10A, also called the Optime 105, offers comfortable, adjustable, and serious noise reduction. The 3M H10A Earmuff has been developed for effective hearing protection in the most demanding noise environments where noise exposures are expected to reach as high as 105 dBA. Hearing protection should be worn around loud machinery and equipment to help prevent hearing loss or damaged eardrums. These 3M optime