Hi all,   I'm looking for the best noise isolation headphone money can buy (Budget is about 400$ - but less is more than welcome).   They are for use at work, so they have to be comfortable to use for hours on end and they need be somewhat stylish as I sit in a gigantic open-office space...

Quick question: Are the wireless Sennheiser RS 220 headphones open or closed?   I'm asking because I've seen the mentioned as closed as many times as I've seen them mentioned as open.    And follow up questions; As I'm looking for closed wireless headphone and these are indeed open, what...