The earpad covers are made from 100% polyester fiber, so they are hypoallergenic and are also disposable. The earpad covers fully enclose the ear cushions of the headphone, helping to keep the headphone clean and improve hygiene. The earpad covers also help deflect perspiration in hot, humid conditions and will not affect the overall sound quality. Since students are no longer in direct contact with the vinyl ear cushions, many will find listening with the earpad covers to be more comfortable and are more likely to stay on task.