Better than I expected!  The canvas material was not stiff at all.  From the picture it looks like its stiff, but its not.
The back part of the heel was a little bit lower than usual so I had no problems with it chafing and giving me blisters.  I received the package one day before we were supposed to go on vacation and no break in time necessary!  We were walking almost the whole day and no problems at all.
I love Toms shoes and think they are the lightest shoes ever but those have no support for the sole at all.  That's the great advantage of these Crocs.  They are a little bit tighter than the all rubber Crocs though.  A size 6M in the all rubber crocs are a little loose on me but these are just right.