The cushion-ribbed headband allows cool comfort all day long and the non-slip wire makes adjustments easy. The larger cup openings are designed to fit most ear sizes. Plus it features a sharp, cool look for increased compliance. Overmolded headband is durable for rugged wear over many shifts and does not have a seam that can split open over time. MX-6 features exclusive Moldex waffled cup foam for superior NRR protection suitable for most noisy environments All Moldex hearing protection is independently tested to ANSI S3.19-1974 by Michael & Associates, Inc., State College, PA. 100% PVC-free, like all Moldex products & packaging for a greener alternative.