Moldex 4600N95 AirWave Disposable Respirator — SmartStrap 0810131538484 NRR 24 provides compliant protection Style:Non Vented (22507) NRR 24 provides compliant protection for hard hat environments where NRR 21 is insufficient — closing the protection gap for workers in louder industrial areas (97 104 dBA TWA) without requiring workers to switch from cap mount to OTH earmuffs or manage separate hearing protection devices outside the hard hat system It is not designed to be worn as a standalone headband muff No valve means warmer in hot conditions cutting don and doff time on frequent reentry tasks while maintaining the AirWave internal air channels for cooler extended wear