Patent ID: 8136265

Claim:
A footwear sole having a soft front midsole, a front outsole provided on a lower surface of the front midsole, a hard rear midsole coupled to the front midsole, and an auxiliary sole provided on a lower surface of the rear midsole and having a coil spring coupled to a rear outsole contacting a ground, the footwear sole comprising: a coupling seat protruding from the lower surface of the rear midsole, and comprising: a through hole formed in a central portion of the coupling seat in such a way as to pass through in a vertical direction; a locking recess formed around the through hole; and at least four pin slits formed independently from the locking recess at regular intervals; a connector coupled to a top of the coil spring, and comprising: a locking protrusion corresponding to the locking recess; an internal threaded part provided on a central portion of the connector; and a spring seat provided along an edge of an upper surface of the connector, and bonded with the coil spring using an adhesive; and a locking pin provided at an end of the top of the spring and protruding to be fitted into an associated pin slit.