The Hang Glider is a device used by Snowball and Firey throughout the first season.
It first appeared in Take the Plunge: Part 1, when Snowball was using it, then he crashed into a mountain and left it there.
In the conveniently named episode Return of the Hang Glider, Firey used it to save Leafy from being crushed by the Announcer Crusher.
It also makes a short cameo appearance in No More Snow! when Ruby and Book being chased by Evil Leafy in the Evil Forest.
Snowball using the Hang Glider.
A silhouette of Firey and Leafy going off into the distance.
The Hang Glider in the Evil Forest
"Hey, Like, what's that thing over there?"