What Our Gearhead(R) Experts Are Saying:"I wore the Bircham Waterproof All Weather Ankle Length Sock through a genuinely soggy trail run and my feet stayed completely dry the whole way. The merino wool interior kept things comfortable without ever feeling clammy, even as I worked up a sweat."Wet trail conditions have a way of ending a run early once feet get soaked, and the Bircham Waterproof All Weather Ankle Length Sock is built to keep that from happening. An Aquasealz(TM) waterproof membrane blocks moisture from outside while still releasing internal vapor, so feet stay dry through stream crossings, muddy singletrack, or a sudden downpour. A merino wool interior adds natural sweat-wicking comfort along with antimicrobial properties that fight odor over long days, while a durable polycolon and nylon outer with 4-way stretch keeps the fit locked in through hiking, biking, or trail running.