This was my second pair of Rainbow sandals/flip flops, and the fit and feel are different from my first.  The look, too, is different.  I retuned the pair, thinking I might have the wrong size, and the second pair is  just as disappointing.
On the good side, the sellers had excellent service and response time to the issues
I'm not sure what happened, but the new Rainbows are not what they used to be, and just don't feel as comfortable; narrow and too snug.