Mack's AquaBlock pre-molded flanged earplugs are constructed of silicone and designed for super soft, super comfortable, waterproof protection. Unique Flex Stem and triple flange design allow for a more customized fit, which increases sealing ability and improves wearer comfort Pre-molded silicone will not deteriorate like similar earplugs made of plastic Helps prevent swimmer's ear and surfer's ear Washable and reusable for extended wear Carrying case included