World most expensive flip-flops will set you back $18,000

Flip-flops, cheap and cheerful staples of summer wardrobes, normally cost less than $20.
What can be so special about this pair, then, which will set one shopper back a smooth $18,000?
Made by Chipkos, 'the world's most expensive flip-flops' feature hand-painted art by renowned LA-based artist, David Palmer. But other than that, they look pretty normal.