Going out West

We are going with Husbands entire family to visit his step-brother and family in December! We are going to have so much fun! The girls have not seen snow since they were 2 years old. They vaguely remember what the stuff looks like.


Now I am on a quest to clothe three children for skiing, sledding and playing in the snow from head to toe. I found a ski trip checklist online. I had forgot about the first layer. A friend said not to get 100% cotton thermal underwear (go for silk or a polyester blend). Does anyone else have any snow/cold weather layering tips? I need all the help I can get!