Been wearing this slippers literally since they were invented.  Not sure how many pairs I've gone through.  But now that they've gone to unisex sizing, the fit is all wrong.  My feet are a pretty ordinary men's 10-medium.  The socks still fit in the length, but they not only feel way too narrow, in a one-to-one comparison with my old pair, the length is the same, but it is clear that they are indeed significantly narrower.  Loved these slippers.  I will miss owning them.