Seal out water. Help prevent swimmer s ear and surfer s ear. Provide protection after ear surgeries. Help relieve flying discomfort. Protect hearing from loud noises. Provide non-toxic, hypoallergenic protection. Provides a better, more comfortable fit and seal than custom ear plugs. Mack s are larger and safer than other kid s size earplugs. Recommended for kids 6 years old and under. Bright color is fun for kids and easy for parents to see. Plastic carrying case included.