The -40 rated Bogs are fantastic! I'm on my second pair. My first were a gift from my mom almost a decade ago and I just replaced them last winter. Super warm but lightweight and flexible. Love that they're as good in slushy puddles and mud as they are in snow drifts. We are subject to epic freeze-thaw cycles, which means a mix of mud/snow/ ice for a good portion of the year. A pair of truly waterproof winter boots -- with no lacing to let in water -- is a must-have for me. I fI had to guess, I'd say that classic Bogs are the #1 boots for kids where I live. They are so easy to get on and off, and comfortable enough to run around in for long periods of time, which makes them perfect for playground use. My kiddo is on his third pair in as many Northeast winters.
I hope the black coat works perfectly out because the cream-coloured one is absolutely gorgeous! I'm rooting for duplication.