3M PELTOR Optime II Earmuffs, 31 dB, Green, Headband, H520A-407-GQ 3M Product Number H520A, 3M ID 7000039619 · · · Ideal hearing protection against noise arising from 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 · · Easy to replace cushions and inserts helps keep them hygienically clean · · Soft wide cushions helps reduce pressure around the ears and improves comfort and wearability · · Easy to replace cushions and inserts helps keep them hygienically clean · · Easy to understand attenuation symbol to help ensure correct product selection · · Helmet mounted version fits directly to many industrial safety helmets without the need for an adapter. · · 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.