No fitting or sizing needed for these pre-molded flanged earplugs. Mack's Ear Seals feature a dual shore (durometer) design (2 plastics with different hardness are used in the molding process). This creates a unique combination of super-soft seal rings for unmatched comfort and a stiffer inner core for ease of insertion.
Mack's earplugs are doctor recommended to seal out water, Mack's Ear Seals help prevent swimmer's ear and surfer's ear and come with a convenient detachable cord. Mack's Ear Seals, seals out noise with a noise reduction rating of 27 decibels (highest ever for a flanged ear plug), making it great for use around power tools, loud concerts, shooting, race events etc. Shatterproof carrying case included (1 pair).