-- Last Updated: Feb-10-13 7:42 PM EST --
The mitts are great, +1 on them as well, I have a pair, they work wonders for me in cold weather.
They are NOT fully waterproof though, but...
a) not a lot of water gets in and what does get it is quickly warmed up and does not bother you much
b) you can fix most of the leakage by dabbing Aqauseal on the inside of the seam
c) in case of serious leakage NRS guys are cordial enough to exchange the gloves!
...and yes, my hands sweat in them at around 0 C as well.