They were originally designed with Japanese rice farmers in mind, so they can handle a lot of muck and general nastiness. And that's exactly the point of wearing rain boots in the first place. But they're not just durable, they're also compact thanks to the folding feature. That makes the boots extra handy because you can take them with you if there's threat of rain, or squirrel them away if the weather turns in your favor. That's pretty awesome, because rubber doesn't exactly breathe. More here.