Answer:
They have a magical power.
"There were wings on his cap and sandals, and he carried a winged staff, around which two golden serpents were twined."
Explanation:
According to the text from "Perseus and the Quest for the Head of Medusa", it is narrated that Perseus is sent by Poseidon to kill Medusa and he is aided by Athena and other gods who ensure his victory and successful escape.
Among some of the things that were given him was a winged sandal and it had magical properties which could make Perseus fly.
The evidence from the text that supports the answer above is "There were wings on his cap and sandals, and he carried a winged staff, around which two golden serpents were twined." which helps to show the theme of magic that the sandal and other gifts contain.
