The 3MPeltorOptimeIII earmuffs have been specially developed for high noise loads and combine effective protection with the highest wearing comfort. The model H540P3EV has a plug-in attachment for helmets with 30 mm slot and is suitable for all Peltorhelmets with the exception of the G2000. The Earmuff has an insulation value of SNR = 35dB and guarantees a high visibility thanks to the Hi Viz design in signal-strong green. The special safety of the OptimeIII is based on the innovative double-shell technology, which minimizes the resonance inside the capsule and brings with it a maximum damping of high frequencies. The advantage: Conversations and warning signals are still easy to understand. An acoustic connection between the inner chamber of the capsule and the space between the shells also achieves an optimum insulation of low frequencies. The soft, wide foam sealing rings ensure a perfect fit. The generous space under the capsules minimizes heat build-up and sweat formatio