The great thing about this type of flats boot (in addition to the thick sole) is the Velcro closure strap around the ankle (black strap at top). The boots fit pretty snugly anyway, but not so snugly that bits of shell and sand can't get in. However, once you snug up the Velcro strap, there ain't nuttin' gettin' inside, except water. If you get a pair, be sure you get them with the ankle closure strap, since I have seen some without this. I first thought going all day with a shoe full of water might be a problem, but it has proved to be pretty comfortable, since the boots act just like a typical wet suit bootie to keep your foot warm. I seem to recall having seen advertised a flats boot with a built-in purge valve to get rid of excess water-seems like a good idea, but I am not certain that it is necessary. You can drive your vehicle with these on (even with water in them) with no problem.
As far as socks go, I have tried both a thin, nylon-type wicking sock that I wear inside hiking boots beneath my regular wool socks, or just a pair of regular, heavy, cotton athletic socks, and both seem to work just fine. The boots are extremely roomy, and caused me no rubbing, no chafing, and no blisters with either type of sock. Just order them in your normal shoe size. Try 'em-I think you'll like 'em, especially if you pedal or paddle a yak, or wade-fish.
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