I have worn my 1st pair of TNF flip flops (from last summer) so much I needed to get a second pair. I have not worn out the old ones yet, but they are so comfy I just wanted to get a 2nd pair in a different color (and then be ready for the day when the 1st pair does need to be retired).
The straps are really comfy, and the footbeds conforms to your feet so nicely. TNF did a great job with these. I went with a 9, which is sizing down a half size for me from my sneaker size of 9.5 As the footbeds wear-in they get just a touch wider and longer, so they end up perfect.