3M Peltor Optime 105 Over-the-Head earmuffs feature double-shell technology to provide effective hearing protection.For noise levels up to 105 dBA, these over-the-head earmuffs with double-shell technology provide optimal hearing protection. The OPTIME 105 features added mass and volume, plus a unique “double-shell” earcup design (two cups connected via a foam inner layer to reduce structural resonances) to provide the maximum in noise reduction throughout the full range of low and high frequencies. . . . .

3M Peltor Optime 105 Over-The-Head Earmuffs With Liquid/Foam Earmuff Cushions