Get smart: a truly tailored fit ensures superior comfort. Embedded Conforming Material Technology™ senses body heat to conform precisely to the wearer's ear canal shape and size. Three-flange tip creates an excellent noise-protection barrier. Fit-almost-everyone system enables one-product, one-order inventory control. Corded/Cordless Pair: Corded; Shape: Flanged; Material(s): CMT Polymer; Noise Reduction Rate (NRR): 25 dB.