E-A-R™ CLASSIC™ II. Due to its slow recovery and response to body heat, the non-flammable polyurethane foam offers optimum adaptation to the auditory canal, thus ensuring reliable noise attenuation. A textured surface and moisture resistance prevent slipping within the auditory canal. SNR = 28 dB (H = 30 dB; M = 24 dB; L = 22 dB).