Its sponge material design has a strong anti-noise ability. The ultimate in earplug comfort, this Sponge putty moulds to the unique contours of any ear and provides a better fit and seal than custom-moulded ear plugs. This mouldable sponge earplugs are versatile, blocking out water and reducing noise by 30 decibels (dB). They're great for sleeping , traveling, snoring, studying, loud music concerts, motor sports, etc.