Spike structure made of different materials and featuring augmented joining strength

A spike structure comprising:

• a sole protruding component made of polypropylene (PP) and comprising a joining ring portion, a first joining portion disposed at an end of the joining ring portion, and a second joining portion disposed at another end of the joining ring portion;
• an interface component comprising:
• a middle portion disposed in the joining ring portion,
• a first receding portion disposed at an end of the middle portion, extended outward, and joined to the first joining portion, wherein the first receding portion is exposed to an external environment, and
• a second receding portion disposed at another end of the middle portion, extended outward, and joined to the second joining portion, wherein the second receding portion has an uppermost surface that is flush with an uppermost surface of the sole protruding component,
• wherein the first receding portion and the second receding portion each have a respective thickness that is less than a thickness of the middle portion and recede toward each other, wherein the first receding portion and the second receding portion are clamped and joined to the sole protruding component;
• and
• a spike component made of thermoplastic polyurethane (TPU), wherein the spike component is joined to the first receding portion and exposed from the sole protruding component, wherein the spike component is entirely vertically beneath the interface component.