Rift Wing
A Rift Wing is one half of a pair of Waychest Wings. It is obtained from Rifts.

Obtaining
Rift Wings are primarily obtained from Rifts. When a Rift is discovered for the first time by each Journey, it will drop one Rift Wing.
Wandering traders also have a very small chance to sell 2-3 Rift Wings for 8-14 emeralds each.
Usage

Rift Wings are only used to craft Waychest Wings (not Elytra). The recipe also requires a Wayfaring Wing. The recipe is shapeless.