I've had the Woodby Blue Dog for a couple of weeks now.  After two days' breakin time, they are absolutely comfortable!  Strap is adjustable, but the toe grip is where the magic is for your legs and feet.  I've noticed that the design will be marred if the Birko-flor gets a scrape or a scratch, but they are really cute.  I've already gotten lots of attention...or should I say, my feet have!  They run wide, so the "narrow" will fit a medium to wide foot, and the "regular" is quite wide!