bought these to replace those fabric, slipper-like 'surf walker' water shoes, which didn't last very long.  Should have gone with Columbia brand all along, the techsun III has a much more comfortable rubber base, they hold up to rough terrain (steep hills, rocky trails and ponds), and fit perfectly.  In shoes, I am a size 11, but sandals / flipflops, I find the next size down is a better, snug fit, regardless of manufacturer.