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. Shatterproof carrying case included.