Moldex 6531 Softies EcoStation Cordless Earplugs — NRR 33 Comfo Respirator and note the condition inside

and note the condition inside 3M's own wording — it covers sprays that do not emit harmful vapours

6435 Alphas vs 6434 Alphas: 6434 Alphas is NRR 27 (reusable flanged)

Detection Performance

Less than 27 dB

and Class 3 is the highest visibility level

Moldex 6531 Softies EcoStation Cordless Earplugs — NRR 33 Comfo Respirator and note the condition insideEDITORIAL REVIEW: 4. 5 5WC Safety Review Moldex 6531 Softies EcoStation Cordless Earplugs Best For: corded reusable flanged hearing protection at NRR 33 dB in a low profile uncorded design. Not For: non noise hazards, or noise that earplugs alone can't bring under ~85 dBA (add earmuffs). Bottom Line: a practical reusable flanged plug at NRR 33 dB the uncorded low profile fit suits tight spaces and high volume single use. Editorial assessment by Steven