The Koss UR40 Headphones are extremely lightweight wired headphones built for hours of comfortable listening. They feature the signature Koss sound performance quality and a functional design for maximum comfort.These headphones feature a hybrid combination of the open and closed headphones style. The leatherette cushions offer a tight seal around the ears for enhanced bass, but the earcups are covered with a permeating mesh. This allows the drivers to “breathe” and perform with improved dynamics. This system also means that you will be able to hear your surroundings without compromising the audio performance of your headphones.