I really like this shoes.  When I wear these shoes, I notice my posture is better.  Because I liked it so much and Amazon had really good deal, I even bought a pair of the Shape-up sandal.  As far as size, I normally wear 6 to 6-1/2 and bought 6-1/2.  It's OK, but maybe 7 may have been better.  For sandal, I bought 6 and it's OK, but maybe 5-1/2 might be better.