The ear foam will the of your headphone. They are really good replacements for WH-1000XM3 Headphones. Replacing earpads not only improves the comfort of the headphones, it also increases the sound insulation factor, resulting in a more pleasant listening Protein Leather resists sweat and increase sound insulation. As earpads degrade, their sound insulation decreases. This results in a loss of the headphone's original sound