Firstly, the Fila Slip On Sandal is very light...a good thing...and has an insole which fits the confirmation of the foot.  However, in very short order  (3 months) the 'foam' outsole began to wear.  These have been worn almost exclusively indoors, and the heel is already showing signs of significant wear!  I estimate another 6 months before discard.
While I enjoy the actual wearing of the Fila sandals, I wouldn't buy them again.  I will buy another pair of Adida Slides because of their longevity.