These flip flops are very comfortable once broken in. The footbed is super supportive. I can tell these will get better with use once the sandal molds to my feet completely. The breaking in process is rough (which is why I have given these shoes 4 out of 5 stars). The shoe straps were tight at first and dug into the tops of my feet, but as I wear them more and more I can feel them start to loosen up. I wear a size 8.5 and got a size large which fits perfectly length wise. I would consider these to run a bit narrow, I have feet that are a bit wider than average and only have about 1/2 an inch of space on the sides of both feet. I stuck with them, however, because of all of the great reviews. I got the 'Sierra' color and love it due to the fact that its neutral and goes with everything.
I love these sandals. I buy a pair every summer. It is important to break them in, so I make sure to wear them to the beach a couple of times to soften the straps and the leather. My feet seriously feel like they are walking on pillows! A summer essential!