Well, as I always do, I wore them in the house for a few hours.  The house is heavily air conditioned so no humidity and there is no 'sweat'.  I removed them to change for an event I was attending where I planned to wear sandals.  To my horror, the color inside the toe box had transferred to my skin and to my 3 day old manicure.  What a mess!  It wouldn't come off.  I slapped a layer of nail polish over it and it didn't cover it well.  It was embarrassing.

Needless to say, I've returned these shoes.  If they can't use a dye on the inside that doesn't transfer to feet, then they're worthless.  (Oh and the heal was painful too.  I knew there would be blisters. )