I was given a pair of Havaianas flip flops about two years ago by a girlfriend for my birthday. While I'm always appreciative of a present, it wasn't until I wore them for the first time that I "got it". They are, by a mile, the most comfy flip-flops I have ever worn. Based on a Japanese sandal made with fabric straps and rice straw soles, all Havaianas have a similar textured rice pattern on their soles, that apparently makes them so comfortable
Take a look at the Havaianas website. I'm sure you will find a style that is perfect for you.