From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Spring Heel

ITEM 5

Price 150 gp

Usage worn

Bulk 1

Fitted into each of these prosthetic legs is a large spring, tightly bound around a collapsible shaft. When released, the spring unspools rapidly and the shaft telescopes out and back, returning to its compressed form and catapulting you forward.

Activate (concentrate, manipulate)

Frequency once per hour

Effect You Stride up to twice your speed or Leap up to 20 feet horizontally and 5 feet vertically.

Pathfinder Treasure Vault (Remastered)ORC