I wondered the same think and saw this review posted from another customer. I will order a pair and update:
"Verified Buyer Reviewed by Kim from Chicago, IL on Wednesday, February 8, 2012
Wore these for skiing in CO and they were amazing. I'm not the best skier, so was ecstatic after several wipe-outs that these were still snow free and nothing got in. They also have inner-leg zippers which came in handy for a quick cooldown during/after a tough session"