The year we went for Christmas DH, eldest DD and I had walking boots but the other two girls had boots like the picture Serenlas posted, one pair was from Next and the other was from M&S. I'd sprayed them with goretex before we'd gone and they stayed nice and warm and waterproof through all the snow until the last day when it started to rain and the snow turned to slush. I can't remember which now but one pair of boots still stayed dry but the other leaked and although we'd taken DD's trainers the tread wasn't very good on the slippery surface so we ended up buying new socks then the lovely CM in the shop gave us a couple of the small bags to put on her feet. Result = lovely dry feet!
BTW, one of my DDs is at agricultural colege and if you wear a thermal welly sleeve in your wellies, it keeps feet really toasty.