Last year both my girls wore a different Baffin boot. My older daughter grew out of hers so I replaced it with this one. For the money, nothing else will keep your feet warmer. If you can keep your hands & feet warm, playing outside in the snow all day is possible. I buy them the warmest boots I can find and the warmest gloves and they are outside all day....HAPPILY playing in the snow. At the Baffin website you can learn about the different ratings and how cold they will go. I always buy the ones with the coldest rating. Warm hands + warm feet = all day fun. I own a pair for myself as well. I don't think I will ever buy a different brand because these just work so well.
While they are big & bulky, they are lightweight.