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3M E-A-R Classic Soft Earplugs are made of a patented, thermal-reactive foam used by the NASA space program. The material feels smoother than ordinary foam, and starts out firm to allow for easy insertion. Then, the plugs warm with the body temperature. They actually soften and shape to the ear canal. This custom, low pressure Seal helps provide an excellent NRR of 31 dB. Better yet, the plugs get even softer and more comfortable with extended wear.