The 3MTM PELTORTM OptimeTM 105 is a high-attenuation hearing-protection earmuff intended for very noisy industrial environments.
Typical specifications for the H10A over-the-head model include NRR 30 dB (U.S. rating), a twin-cup design to improve high- and low-frequency attenuation, liquid/foam-filled sealing cushions, and an adjustable padded headband.
It is commonly suitable for mining, heavy manufacturing, construction, grinding, drilling, power plants and other high-noise workplaces.