They sit right ON the ears, not AROUND around them. It measures about 6-7 inches thick once fully expanded so it is a good size. The LED light makes it easier to find items in the dark (and day for that matter). They are comfortable and cushy. Loved this so easy to adjust and tighten. ***Update Daily useCall and audio quality is good, using a BT headset also good. I dont very many reviews, but I love these headsets so much that I purchased a second set. To get the most out of a headphone like the HD800S, you do need other critical components to work in conjunction with it. Night shots come out very well and interface is very easy to use if you are familiar with how trail cams work. It was very flimsy.