A:Answer Our Quantum Series is made up of various materials such as Polypropylene, Polycarbonate/Acrylonitrile butadiene styrene, Polyoxymethylene, Thermoplastic elastomers, and PU leather with the earpads. Sweat that sits on the cushion can penetrate inside and leave the earpad prone to cracking and peeling. It’s important to wipe away any moisture when you’re done using the headphones.