Extreme Gears are objects that appear in the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing. It is a term used to describe various airborne vehicles designed for speed and versatility. They are popular with various factions.
Extreme Gears come in a variety of sizes and shapes, although most of them generally resemble airboards. Being hovercrafts, they can fly through midair (either just above the ground or through the sky) at incredible speeds.
Battle For Angel Island
When their battleship was about to crash on their way to Angel Island, Sonic the Hedgehog and Knuckles the Echidna used their personal Extreme Gears to abandon the ship and fly the rest of the way to Angel Island.
Bonds of Friendship
Having targeted the Mineral Museum in Spiral Hill Village, which held valuable minerals, the Babylon Rogues used their Extreme Gear to plunder the Mineral Museum and escape back to their blimp with the spoils.