Wing Cap

The Wing Cap is the first cap unlocked in Super Mario 64. It is unlocked in Tower of the Wing Cap. It is found in red ! boxes, and allows the player to fly around by doing a triple jump or shooting out of a cannon. In Super Mario 64 DS, it is still found in red ! boxes as a feather instead of a Power Flower, exclusive to Mario. It appears in the ending of Super Mario 64, as well as the box art. It is the most well known of all 3 caps.

Metal Wings
Despite not being able to collect both the Metal Cap and the Wing Cap at the same time, there is an unused texture for metal wings. Using hacks to equip both caps allows the player to see the metal wings in the game.