The present invention relates to earplugs of using specifically designed for underwater and protecting the hearing from the deafening noise or the like,; Formed from a portion inserted into ear canal to be inserted into the ear canal integrally on one side of the body, in a through hole is formed inside the filter is inserted earplug,; Hameuroseo the advertising surface is formed on one side forms a cap on the original advertising insertion part formed at the other side separately, and forming the insertion groove portion is inserted in a cap ads posted to the ear canal insertion part opposite side surface of the body is inserted,; It will get a hearing protection and advertising and promotion by the action of sound insulation earplugs effect at the same time.
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