sneaker, trainer, slipper
Los calcetines y la zapatilla son nuevos.
The socks and the shoe are new.
Entonces tienes dos, ayer vi otra igual dentro de una zapatilla.
So you have two, yesterday I saw another one just like it inside a shoe.
— Indagine su un cittadino al di sopra di ogni sospetto (1970)
El chico ha perdido la zapatilla.
The boy has lost his shoe.
Es la zapatilla más cara que haya visto.
It's the most expensive sneaker I've ever seen.