Bought these for my dad Father's Day 2011.  He wore them in the yard after a storm, and then walked through a small creek that was well beyond his sock line.  He took his boot off and his boots were soaked, but inside his sock was 100% dry!!!  It was hard to believe but these really do work.  P.S.  for any negative reviews, you can't jump off a diving board into a lake and keep your legs dry with these... be serious.