Super soft foam. High NRR 32 dB. Trusted since 1992. Hear for life. Tested according to ANSI Specs S3. 19-1974. The level of noise entering a person's ear, when hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR. Example: 1. The environmental noise level as measured at the ear is 92 decibels dB(A). 2. The NRR is 32 decibels (dB). 3. The level of the noise entering the ear is approximately 60 dB(A). Attenuation Chart (ANSI S3.19-1974): Frequency 125: 38.4 (dB) mean attenuation, 2.9 (dB) standard deviation; Frequency 250: 40.3 (dB) mean attenuation, 3.5 (dB) standard deviation; Frequency 500: 43.2 (dB) mean attenuation, 4.0 (dB) standard deviation; Frequency 1000: 41.8 (dB) mean attenuation, 3.8 (dB) standard deviation; Frequency 2000: 38.6 (dB) mean attenuation, 2.6 (dB) standard deviation; Frequency 3150: 45.0 (dB) mean attenuation, 2.8 (dB) standard deviation; Frequency 4000: 45.7 (dB) mean attenuation, 3.5 (dB) standard deviation; Frequency 6300: 49.6 (dB) mean attenuation, 3.8 (dB) standard deviation; Frequency 8000: 47.3 (dB) mean attenuation, 4.3 (dB) standard deviation. Noise Reduction Rating: 32 Decibels (when used as directed). The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (higher numbers denote greater effectiveness). Made in the USA.