noun
elevator shoes; height-increasing shoes
Shoes with hidden lifts inside to make the wearer appear taller. A wasei-eigo term from 'secret shoes'.
wasei-eigo (Japanese-coined English), from secret shoes
彼は身長を高く見せるためにシークレットシューズを履いている。
He wears elevator shoes to look taller.
Variant with a middle dot; less common but still seen.
厚底靴 are platform shoes with a thick sole visible from the outside, while シークレットシューズ have hidden internal lifts.
Wasei-eigo from English 'secret' + 'shoes'. The English equivalent is 'elevator shoes' or 'height-increasing shoes'.