ProCase Professional Safety Ear Muffs are made with noise-dampening sponge material and offer a NRR 28dB rating which certified by ANSI S3.19 (US), efficiently filter out sounds to a minimum for hearing protection. With pressure diffuser technology, the padded headband reduces the pressure and provides your maximum comfort without adding much weight or bulks. Adjustable headband and soft ear cups ensure snug fit for various head size. It is perfect for gun range, hunting, manufacturing, yard work and etc.