First, the reason:
Although the design of snow boots is loose, it does not conform to the mechanical structure of human body, especially the flat bottom, unstable support point for feet and uneven gravity distribution, which will lead to problems in the arch of feet. It's not a problem to wear it when walking, but it can't be worn for a long time, otherwise it will do some harm to your feet.
Second, matters needing attention:
Children's feet are not fully developed, especially not suitable for wearing snow boots.