3M Peltor Optime II H520B  Neckband Earmuff is 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. Easy to replace cushions and inserts helps keep them hygienically clean. EN352-1, SNR 31