ngl they’re probably laughing at something really dumb.
Israel bundles up pretty heavily when she visits many of the other countries during their fall/winter. there are parts of her land that get snow and cold weather, but for the most part her home is a pretty warm place and so she gets cold easily in other places.
given that her home is a warm place, she tends to be pretty warm herself and thus the sort of person who is good for cuddlin’ in the colder months. (whether you might be allowed to cuddle her is another question entirely).