The Mack's Ear Seals seal out water and reduce noise. Package includes one pair and a storage box. Dual Durometer Design - Two plastics used in the molding process allow for ease of insertion and unmatched comfort. Dual Purpose - Seal out noise with a noise reduction rating of 27 decibels (higest ever for a flanged earplug) 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. Washable and reusable