The Predator Gold is a great all around muff. Indoors or outdoors it provides the best in comfort, reliability and performance. The NRR (noise reduction rating) is 26. Exclusive DLSC Technology has the fastest response time in the industry at 1.5 milliseconds. Military grade dual circuit boards ensure a rugged and reliable pair of ear muffs, no wires to break or get snagged. Maximum adjustability.