Wet feet, also known as "airplane", is a movement technique that sets Jak to a grounded state while in mid air. This grounded state gives Jak a small frame window to perform a limited amount of other movement techniques as if he were standing on a normal ground surface. These movement techniques include combinations of jumping, punching, spin kicking, and zooming.
The technique is performed by first entering one body of water, and then, without moving below the original body of water vertically, moving above another body of liquid (including dark eco or lava). Upon falling to the vertical coordinate of the first body of water, a standing state will be obtained for a short time, allowing the execution of other actions.
The technique is called wet feet because the setup requires Jak to enter a body of water for a moment. It is also referred to as airplane because it gives Jak a horizontal ground plane in the air that allows for more movement inputs.
Currently, wet feet has no application in speedruns and serves more as a swag strat.
There is an instance of wet feet that commonly occurs in Lost Precursor City, but Bobbykaze was the first runner to discover that the technique was directly related to Jak interacting with water. After messing around with the water fountain in Sandover Village, Bobbykaze made his way over to the farmer's hut and encountered a mid air standpoint when roll jumping off a small ledge. He then reported the incident in the community discord server on June 24, 2020. Other speedrunners and glitch hunters soon began investigating the technique and where it could be applied in speedruns.