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Etymotic Research ER•20 XS High-Fidelity Earplugs (1 Pair) Large FitNoise-induced hearing loss is preventable! Etymotic Research's ER•20 XS High-Fidelity Earplugs reduce sound levels while preserving sound quality and clarity. ER•20 XS earplugs are configured to replicate the natural response of the ear, so sound quality is the same as the original, only quieter.Music, voices and other sounds are clear--not muffled--making ER•20 XS ideal for concerts, clubs, theaters, aircraft, construction, yar…
