The full size Koss RUK50 headphones are the boldest headphone in the RUK series. With enhanced elements and a perfect lightweight fit, the RUK50 produces rich booming bass in style. The fit of the RUK50 creates a noise-isolating environment, perfect for experiencing music the way it was meant to be heard. The noise-isolating fit produces a more controlled environment for listening uses. An adjustable padded headband with soft isolating cushions will fit most head sizes for maximum comfort. The RUK50 folds flat for quick and easy storage or portability.