Leather or PU earpads have a thin surface cover and memory foam on the inside. Some of our headphones come with high-quality, real-leather earpads and should be cleaned with a slightly damp or dry cloth. Ear cushions are subject to normal wear and tear and should therefore be replaced periodically. Dirt or degradation of the foam in the earpad may effect the sound quality. You can find the suitable replacement components in our online shop.