Outings are much more pleasant when your feet stay dry throughout! But this is the #1 problem when shoes get taken off the beaten path. So our design team worked hard on this very issue. Here we've integrated a breathable, waterproof membrane underneath the upper, one that keeps water from getting in (rain, dew, etc.) while letting perspiration out. And we tested it in the lab, with 50,000 flexes in water - equivalent to approximately 20 km or 8 hours of walking - without water infiltration.