Answer :
Icelandic youngsters are expected to place their shoe in the window on the night before December 12 since that is when the first Yule "Stekkjarstaur" or Sheep-Cote Clod arrives in town.
The youngsters keep the shoe on the window sill until Christmas in the hopes that the Yule lads, who arrive in town one by one from the mountains on the nights before Christmas, will leave a small gift for them.
The kids have to earn these little gifts because if they don't behave, they might find a potato in their shoe. Even though the tradition is now widely established, it wasn't always that way. There was some ambiguity in the beginning around the number of nights before Christmas the shoe should be in the window as well as the size of the gifts.
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