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Clue #1 These things help you walk on snow.
Clue #2 You are looking at the underside.
Clue #3 These are made out of aluminum and plastic, but traditionally, they are made out of wood and rawhide.
They are a pair of snowshoes. They help you walk on snow, because they spread out your weight over a greater surface area. This means you won't sink as deep into the snow as you would in normal shoes. Snowshoes have helped people get around in snowy environments for hundreds of years.