Sole with removable insert
Spring cushioned shoe
Spring cushioned shoe
Spring cushioned shoe
Spring space shoe
Spring-air shock absorbtion and energy return device for shoes
Spring-loaded snap-type shoe
Springy sports shoe
Stabilizing grid wedge system for providing motion control and c
Sweet spot sole construction
Torsional spring insole and method
Trampoline effect athletic shoe having elastic sole return strip
Walking and hopping shoe with a massaging sole surface