These sandals are the perfect sort of rubber, it doesn't get misshapen. They are comfortable, much more so than a regular flip-flop, as they have a molded interior with some mild massage bumps and a toe ridge. Plus I prefer this heel height to flat. This is my 3rd pair. The first pair broke in the washing machine (they don't wash in the machine as touted) and the second pair I'm just finally seeing wear on the heel, but after wearing them umpteen times this summer. Finally, much more dressy and a better fit than traditional flip flops.