Just imagine a slipper that can get wet and dirty but not slippery. And when they're dirty just step into the river to clean them off. I am going places with these I've never before gone with flip flops. FITTING can be funky. If you have a narrow foot or you want them to fit tight go with your normal size. But if you want them to fit like a hawaiian flip flop or have a high volume foot go 1 full size up. Also the footbed on this sandal is shorter than the same size Z1 or Z2. If you spend alot of time outdoors and want a durable flip flop, you can't go wrong here.