NRR 27. Good Looks And Style. The MX-5 is a cool and comfortable upgrade in earmuffs. The larger cup openings are designed to fit most ear sizes. The cushion-ribbed headband allows cool comfort all day long and the non-slip wire makes adjustments easy. The MX-5 is easy to wear and durable, have a sharp, cool look and increase compliance. Part of the MX Series by Moldex. Lightweight Metal Band Design. Lightweight wire frame allows easy cup adjustment, yet holds its position for lasting comfort. Features: Soft cushion-ribbed open air headband for cool comfort all day long, Overmolded headband is durable for rugged wear over many shifts, Larger ear cushions allow freedom to fit almost all ears comfortably, Lightweight wire frame allows easy cup adjustment yet holds its position for lasting comfort, Cool looks and comfort to promote worker acceptance and compliance, Extra soft foam/low pressure cushions and headband are PVC-Free, Glossy surface for easy cleaning and longer wear, Independently tested NRR for protection you can count on.