I recently got a pair of Saunk's Cabrio Breeze slips on and loved them, so I thought these would be the same fit.  They are much tighter, made for someone with a rather flat foot, I guess?  I quite know how to describe it... it's like there isn't enough vertical space in the shoe.  My Cabrio Breeze Sanuks fit great and are super comfortable, but these feel too tight, and they are narrow in the toe.