While the fabric has a waterproof coating, the seams aren't sealed, meaning that water will slowly soak the mitten through the seams if it's in wet snow long enough. So yes it can get soaked through, but it will take a good deal of rolling around in the snow for this to happen.

If you continue to read the description, it indicates that these have a waterproof coating,which means this won't be an issue. That said, unless the gloves are goretex, eventually they will likely get wet if your kid is out all day - so the added warmth protection is a good backup.

It is hard to pin point since everyone has different Metabolisom. I have these Mitt for my daughter we live at 9000ft in Colorado. These seem to keep her hand warms and there are day where we don not get above 0. They do have a windproof waterprook lining so you should be block from those elememts.

These are made in China.

From the size chart: "Hestra gloves are measured using Length and Perimeter. Length: from the tip of the middle finger to the breaking point in the wrist where it joins the palm. Perimeter: Measure around the widest part of the hand, do not measure around the thumb."The size chart is true to what it reads.