Sony MDR-NC60 Noise Canceling Headphone (Old Version) Adjustable, foldable headband Lightweight 230g Built-in monitor switch to mute music to listen outside Up to 85% (16.5dB at 200 Hz) ambient noise reduction Premium case Up to 85% (16.5dB at 200 Hz) ambient noise reduction Built-in monitor switch to mute music to listen outside Premium case Lightweight 230g Adjustable, foldable headband