3M PELTOR Optime 2 Ear Muffs 31dB. 3M™ PELTOR™ Optime™ II Earmuffs have been developed for demanding noise-hazard environments. A suitable choice for environments with substantial industrial noise or construction machinery, like airports and agricultural work. Soft wide cushions helps reduce pressure around the ears and improves comfort and wearability. Large space inside cup helps reduce moisture and heat build-up. Attenuation rating (HML) H=34 M=28 L=20. SNR 31dB.