The UR40 by Koss combines high sound intensity with an ultra-lightweight design, making it the ultimate choice for mobile use. With improved signal transmission and conduction for clean and clear sound, this headphone minimizes mechanical distortion and ensures extremely precise sound reproduction. The UR40 is a hybrid headphone that brings together the best of closed and open headphones. Closed artificial leather ear cushions create a tight seal around the ears to enhance bass frequencies, while shielded ear cups provide an open, transparent sound that connects you with your surroundings. The result: a clear, full, and fantastic sound that transforms every recording into a "live" performance.