Tried my grey size 5 they are going back even having a massively wide foot, this morning I'm walking out of them.
I can get my thumb in the back, so if a size 4 is wide enough I'm sure it would be fine length wise.
Having said that the size 4 would have to be sized accordingly but reports are some different colours labelled the same size are different.
Sadly by the sounds of it, I predict many returns for this TSV.
I'm still trying mine out. They aren't slopping off but they do feel a bit loose. Ive also noticed that, when you've had them on for a while you get a strange sound which I have found out is my feet sticking to the gogomat logo inside. Not sure how I can cure that.
I agree that they will get a lot of returns. The only thing is I suppose, if you are prepared to wait, you might get the size you want from returnees.