with the amount of thuggery these mitts will bring you, you dont even need them to work
but seriously, if the description is accurate and they really have a cordura outer layer, waterproof layer on the inside and rubberized palms then yes they should be very waterproof, but I would be concerned with durability for a price that low. Also, it seems like they have very little breathabiity which means your hands are bout to sweat fierce. check out some of the shit on defcon's website, some of the gloves are around that price range and are quality gloves too
"Skiing isn't about who can look the best on camera and throw the biggest tricks, skiing's about getting out there with your friends and having fun."