Shoes Diablo Ski How Do You Say "the Upturned Bottle Caps" In Spanish?(For A Piece I'm Writing Referring To Guillermo Del Toro)?

How do you say "the upturned bottle caps" in Spanish?(For a piece I'm writing referring to Guillermo Del Toro)? - shoes diablo ski

I write a text in Spanish, who take influences on TDM to Pan's Labyrinth (El Laberinto del Fauno) and others, like Cronos and Devil's Back Bone (The Devil's Backbone).
It is important that when I was younger, SLM, to illustrate the religion of his grandmother made him walk to school "bottle tops up" in the shoes ... AY!