Only the vmoda m-80 and the Philips Citiscape seem to make direct claims about noise isolation. I work in a big computer lab with lots of people and machines, I want to drown it all out and just hear my music. The Sennheiser Amperior with their milled aluminium cups might be good at blocking noise, but looks like they're on the ear, not over the ear. Tried on the ear before and they hurt me. Comfort and light weight is important to me.