PRO EARS Ultra Sleek Ear Muffs NRR 26 Pink The Pro Ears Ultra Sleek hearing protection ear muff advantages are the superior comfort, quality and performance. Ultra Sleek ear muffs have an NRR of 26, are very comfortable and stylish. They are ideal for range use, indoor or outdoors, long guns and shotguns can be shoulder mounted with out interference. If you are an active shooter who wants great protection, comfort and style, the Pro Ears Ultra Sleek model is ideal.