The construction and materials in Iron Rangers are excellent. If you treat them well, they'll treat you well. When you think of it, no leather should really be exposed to water. IR's are an oil treated leather that like any leather, should be treated with regularity throughout it's life time. If you are talking about exposure to a rare rain and that exposure is something like running from a car to a building or vice versa then I don't see that there would be any problem at all. If you are talking about regularly slogging through ankle deep puddles where the boots will become totally saturated, then that's another thing.