Another innovation from 3M™ E-A-R™, E-A-R™ Classic™ SuperFit™ 30 has a built-in visual check - the orange fitting ring. If the ring is visible after insertion, refitting is recommended for best hearing protection. Reusable Pillow Pack helps keep earplugs clean when they are not being worn. Conforms to the shape of the ear canal to help create a comfortable, snug noise barrier. Slow-recovery earplug foam is flame-resistant and moisture-resistant.