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 infections Provide protection after surgeries Help relieve flying discomfort Protect hearing from loud noises Provide non-toxic, non-allergenic protection Provide a better, more comfortable fit and seal than custom ear plugs Get a good night's sleep when sleeping with a snoring spouse Carrying case included