Improving signal transmission and conduction for a clean and clear sound, the UR40 minimize mechanical distortion to ensure exceedingly accurate sound reproduction. Featuring a hybrid design, the Koss UR40 integrate the best of closed and open style headphones. Closed leatherette ear cushions form a tight seal around the ears to enhance bass frequencies, while screened ear cups provide an open, hear-through sound that keeps you in tune with your surroundings. The result is a clean, full frequency, great sound that turns every recording into a “live” performance.