It is a Zora tunic, created by an amphibious race of people. It will allow you to breathe underwater.

[Panic rises up in her again briefly when Zelos greets Link. What had she been thinking? Was this really necessary? She could just - no. She couldn't. If this Link decided to treat her like his Zelda, she wouldn't be able to say no. They had just met and already she wants to grab on and hold him and apologize for sending him away, to promise she'll never do it again.

This is for the best.]

This is Zelos, Link.