The ultimate in earplug comfort, Mack's silicone putty molds to the unique contours of any ear.  Doctor recommended to: 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