Goblin Glider

Goblin Glider is an engineer-only permanent "enchant" to cloaks. When activated, it unfolds into a glider that not only slows the engineer's fall, but also provides a small burst of thrust and can be steered in the air for up to two minutes, or until the engineer touches the ground. This can only be activated every three minutes. However, the tooltip for the schematic shows the effect as lasting only 30 seconds, with a five minute cooldown.

Source
The recipe for this item is learned from Engineering trainers.