From Sonic Retro
The Jet Anklet is an upgrade available to Tails in Sonic Adventure. It enables the fox fly further by boosting his speed while in the air. The upgrade attaches a pair of metallic boosters to the back of Tails' sneakers.
- Function: Increases Tails' speed while flying.
- Location: Station Square Adventure Field. Near Twinkle Park, there is an area that leads to the sewer underneath. Inside, there will be a small opening in the ceiling. Fly up in there and the Jet Anklet is right inside.
- Requirements: None.
- Required For: Nothing--it's purely a novelty item to make Tails' life easier when flying, although it is very useful for the long jumps between buildings in Speed Highway.