SilentSound 37 dB NRR Sound Technology Safety Ear Muffs with LRPu Foam for Shooting, Music & Yard Work, Black Featuring the highest 37 dB NRR available, our padded earmuffs offer the best protection available! Fully adjustable, our Safety Ear Muffs are great for men and women of virtually any age. From using firearms to handling machinery, our earmuffs are great for any project, big or small! To help ensure your safety, we used LRPu foam developed by NASA to help reduce low-mid frequencies. Three Month Warranty: Were offering you these Safety Ear Muffs with our risk-free warranty.