These collapsible,high-end headphones are ideal for professional monitoring use. The hd 380 pro offer a closed,circumaural design which provides excellent passive attenuation of ambient noise while sennheisers eargonomic acoustic refinement (e.a.r) technology channels the audio signal directly into the users ears. These professional monitoring headphones also provide an extended frequency response with increased sound pressure levels (up to 110db) for accurate sound reproduction in all types of demanding usage. The lightweight and secure fit design offers a very comfortable listening experience to the sound professional,who has to wear them over long durations.