Jiraiya's sandal (Earth-1529)

Jiraiya's sandal was a sandal worn by Jiraiya, one of the three legendary Sannin, that favored comfort and mobility over beauty and the more complex-designed sandals used by other shinobi and people around the world. He frequently used the same sandal, as his foot's stench was strongly embedded into it.

History
After Jiraiya was captured by Jiryu and his men on Ba Sing Se, the Sannin intentionally left his sandal on the road to enable Naruto Uzumaki to track him down duo to the stench coming from it. This allowed Naruto to intervene in time and stop Jiryu from crushing Iroh's hands.

Before the reemergence of Sozin's Comet, Naruto used the sandal in a similar situation as he and the rest of Team Kakashi needed to find Jiraiya again. Naruto used the smell of the sandal so that June's shirshu, Nyla, could find his master. After they found Iroh, Naruto complained about Jiraiya's strong scent.