US Patent 8186081 Torsion control devices and related articles of footwear

Torsion control devices for use in an article of footwear are disclosed. An article of footwear comprises: a sole having a forefoot portion and a rearfoot portion; and a torsion element disposed in the sole, wherein the torsion element allows the forefoot portion to rotate in a first direction relative to the rearfoot portion and restricts rotation of the forefoot portion relative to the rearfoot portion in a second direction.