Hurricane III, with SureFire EarLock® Retention Rings and Noise-Reducing Filters, provides up to 40 dB of protection against loud noises while preserving situational awareness. In open position, Noise-Reducing Filters allow ambient sounds and conversations to be heard clearly. In very high noise environments, closed position reduces ambient background noise by 21 dB. Low-profile design, which can be worn while wearing helmet or mask, also includes noise-canceling microphone.