The 3M™ PELTOR™ Welding Helmet Ear Muffs H505B are designed to be used with the 3M™ Speedglas™ 9100. These ear muffs provide moderate level of attenuation that meets the needs of most welding industry applications. Modern, stylish slim line cup design. Liquid sealing rings for improved comfort. Easy to replace cushions and inserts helps keep them hygienically clean. Large space inside cup helps reduce moisture and heat build-up.