Peltor Optime 2 Head Band Ear Defenders. Protection of 31d B. Conforms to EN352-3. Recommended for noise levels of between 94d B (A) & 105d B (A). Ideal for high & medium frequency noise. Suitable for use in environments with substantial industrial noise or construction machinery, airports & agricultural work. Low profile with generous inside depth makes it easy to team with other equipment & means that the ear rests comfortably. Easy to use fully Multi Position Padded Wide Head Band with 4-Point Steel suspension that distributes pressure for comfort. Wide, comfortable sealing rings are filled with a unique combination of liquid & foam, which gives optimum sealing & low contact pressure, ensuring the best possible comfort even during long-term use.