Heavyweight sound teams up with an ultra-lightweight design to create the ultimate in on-the-go listening. With an improved signal transmission and conduction for a clean, clear sound, the Koss UR40 headphones will minimize mechanical distortion and ensure accurate sound reproduction. The hybrid design integrates the best of closed and open-style headphones. The closed leatherette ear cushions form a tight seal around ears to enhance bass, while the screened ear cups provide an open, hear-through sound that keeps you aware of your surroundings. The result is a clean, full frequency, great sound that turns every recording into a "live" performance.