3M™ E-A-R™ Classic Soft™ earplugs are made of proprietary thermal-reactive foam. The plugs start out firm for easy fitting then soften from body heat for a comfortable fit. Benefits •Proprietary thermal-reactive foam •Poly bag keeps each pair of corded earplugs clean before use. •Regular size fits most earcanals. •Noise Reduction Rating (NRR)* 31 dB. CSA Class AL.