With respect to all previous advice - it's out of date if you haven't tried the new DC X11s. I've just installed a pair in an Astro (with twin plug to US adapter) and they are the most comfortable, lightest, best ANR set I've ever used. They have nothing in common with previous DC ANR sets (I've had some) - passive performance is good, the ANR is excellent and they fold up very small. The different right/left ear gel seals (with furry covering!) are stunningly comfortable. Cheaper than the Bose, I think nothing comes close.