This is a 6, and as you can see, a 5. I’m glad I did as it was my first pair and I’m usually a standard 5 but I measured a 4 narrow. The box I received showed 9. Until 4:50 when I set off for work. Backing stays in, havent had a problem with it. Works well for music but when I try to listen to books its just too quiet to follow. (Old lady shoes that dont LOOK like old lady shoes! Supposedly you arent supposed to wear jeans and sandals if you are a guy, whoever made that rule is stupid. Ive been having a difficult time wrapping my head around wearing suede in spring and summer. I would recommend using a mouse pad with this one for best experience since it doesnt feel right somewhat when I used it on your typical wooden table surface (although it still function just fine).