Those are actually the iron boots and you need the hover boots item to get it. The hover boots item is one of the missable secret items that you get by not getting the L01 and L02 items for a while. So, technically what you see there is also a secret missable item. There are more of these kind of special items than I could count and there are also some places (including an entire dungeon) where you can get only with them. So, replaying Valami never ceases to be fun!
This quest of mine is what I like replaying the most.