The Iron Boots are an item found in The Legend of Zelda series. Despite being in only 3 games, they change a a good bit every time.
I do remember it most in Ocarina of Time as the only way to walk underwater. It was bit annoying switching back and forth between boots, but it was mainly only for one temple.
Twilight Princess had them feature a nifty magnetic ability as well. I wished they were used a bit more though.