1 BRAND FOR PREVENTING EAR INFECTIONS - Mack's is the 1 Doctor Recommended Brand to help prevent swimmer's ear infections. Also helps prevent Surfer's Ear. Mack's are so trusted, they are the Official Earplugs of USA Swimming!. EXTREME COMFORT - Pre-molded, flanged earplugs made with SuperSeal Ultra Soft Silicone, providing ultimate comfort for extended wear. EASY TO USE WATER PROTECTION - Unique Flex Stem and triple flange design allow for a more customized fit, increasing sealing ability, effectiveness and comfort. HIGH QUALITY - Long lasting, durable silicone will not deteriorate like similar earplugs made of plastic. Washable, reusable and latex free. DURABLE STORAGE CASE for on-the-go convenience. Mack's AquaBlock keeps the water out! Satisfaction guaranteed.