GORE-TEX is 100% waterproof. Water resistant is
something completely different and will not last under
extreme conditions. GORE-TEX membrane contains over 9
BILLION microscopic pores per square inch. These pores
are 20,000 times smaller than a water droplet and 700
times larger than a water vapor molecule. The result:
GORE-TEX is completely waterproof from the outside,
while being highly breathable from the inside.