Foot lining does NOT lead to stagnant odorous conditions when wet. There doesnt seem to be any loss of sound quality over the original. (Relatedly, the sound reproduction is more accurate than the QC-15s). Well, that tells me a whole lot of nothing; Gee, thanks for no tech information whatsoever. I was a bit hesitant to buy this after seeing some reviews about it not being genuine. Got a pair for every member of the family. The accordion style of the hose makes the body of the hose larger than the coil type I was using. Power and plus minus for volume. My last ones had soft rubber soles. The soles are slippery as well as the inside lining.