We use the over the ear kind that Delta used to give out:
http://flight72.storenvy.com/product...ght-headphones

No over the head piece, so that are very light, and each ear kinda clips on. Plus, they take next to no space/weight in carry ons.

Downside is they fail. We wondered why she didn't want to watch more than a few minute on our last flight. When we got home we realized they didn't work. Silent videos aren't nearly as entertaining.