Moldex 4600N95 AirWave Disposable Respirator — SmartStrap 0810131538484 NRR 24 provides compliant protection Size:13 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 or stream of visitors needs eye protection it does not supply any The Moldex 4600N95 AirWave Disposable Respirator — SmartStrap is NIOSH approved under 42 CFR 84 Subpart K for non oil based particulates at ≥95% efficiency