Developed for demanding, noisy environments. Optime II ear muffs muffle even extremely low frequencies to a maximum degree. The sealing rings are filled with a unique combination of liquid and foam, resulting in an optimum seal with low contact pressure, providing agreeable comfort even during long-term use. The sealing rings have ventilation channels and are covered with a soft, hygienic foam. Optime II is a suitable choice for environments with substantial industrial noise or construction machinery, airports and agricultural work. Muffles even low frequencies. Optimum seal. Low contact pressure. Comfortable.