Noise Reduction Rating 33 Decibels (When Used As Directed)EPA Regulation Sound advice from hearing professionals Hearing loss is irreversible so it is imperative that you safeguard your hearing from jackhammers, sirens and other extreme noise levels that harm nerve endings. HEAROS Xtreme Protection Ear Plugs prevent a deluge of damaging decibels from assailing your ears. These soft polyurethane foam hearing protection plugs give you a customized fit by conforming to the contours of your auditory canals and blocking out loud noises that cause hearing loss. HEAROS Earplugs have been tested according to ANSI specifications S319-1974 for your peace of mind. One of a kind designed for comfort, easy use, maximum hearing protection HEAROS Ear Plugs are made of hypoallergenic foam, making them safe for the most sensitive ears. A soft, closed-cell skin prevents dirt build-up and permits comfortable wear for long periods. Our unique formula and design lets you roll the plugs between your fingertips and then insert them in your ears. Enjoy the game from the 50-yard-line, block out your snoring spouse, or enjoy your new book in solitude. With NRR 33 being the highest grade for foam ear plugs, these noise-cancelling HEAROS Ear Plugs combine superior comfort and protection for your hearing. The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (Higher numbers denote greater effectiveness).