• Noise Reduction Rating (NRR)*: 27 dB. CSA Class AL
• Fit can be verified with 3M™ E-A-Rfit Dual-Ear Validation System
• Replaceable ear cushions and foam liners (3M™ PELTOR™ Hygiene Kit HY54)
• Stainless steel construction resists bending and warping
• 3M™ E-A-Rfit™ Dual-Ear Validation System testable
• Wide range of applications may reduce inventory needs
• Use for protection in hazardous environments. For workplace/occupational use only

• Noise Reduction Rating (NRR): 27 dB
• Mount Type: Hard Hat Attached (Cap-Mount)
• Technology: Double-shell design for broad frequency noise reduction
• Headband: Stainless steel, resists bending, low-pressure fit
• Color: Black/Red (for high visibility)
• Applications: Assembly, Grinding, Machine Ops, Welding, Construction, Maintenance
• Features: Replaceable cushions HY54, testable with 3M E-A-Rfit System 

Designed For:

• High noise environments (up to 105 dBA)
• Industries requiring hard hats, such as construction, manufacturing, and mining 

(1) Peltor Optime 105 Cap-Mount Earmuffs

Will these earmuffs provide effective hearing protection?

Yes — the 3M Peltor Optime 105 Cap-Mount Earmuffs are rated 27 dB NRR, offering strong noise reduction for loud environments like construction, manufacturing, and heavy machinery operation.

How do cap-mount earmuffs work?

They attach directly to your hard hat’s accessory slots or slots adapters, keeping the earcups properly positioned while leaving your hands and head clear for work.

Are they comfortable for long periods of use?

Yes — they are designed with soft, foam-filled ear cushions and a low-profile design to reduce pressure and fatigue during extended wear.

Are these suitable for industrial and jobsite use?

Yes — with a high NRR and rugged construction, they’re well-suited for industrial, construction, and other high-noise workplaces.