This sandal is great!  It is really pretty and much more "delicate" looking, not chunky looking like most teva sandals.  It stays on well, and is very comfortable, and holds up well, I have been wearing this constantly for months, getting wet, and it still looks the same.  No need to size up, get the smallest shoe size you usually wear.  My favorite thing about this sandal is the strap on the outside of the foot is very low, and hits below the littlest toe, not covering or rubbing on it.  This looks nice enough to work in but you can hike in it.  I would totally recommend this sandal!