MACK’S Ear Seals – Seal Out Water and Noise SNR 27dB. Dual Durometer Design – Two plastics used in the moulding process to allow for ease of insertion and unmatched comfort. Dual Purpose – Seal out noise with a noise reduction rating of 27 decibels (highest ever for a flanged earplug) and exceptional ability to seal out water. Super Soft Seal Rings – Incredibly soft for extreme comfort. Detachable Cord – Convenient for hanging plugs around your neck in environments where noise comes and goes. Quickly and easily remove the cord for water activities. MACK'S Ear Seals are Washable and Reusable a Shatterproof carrying case is also included.