What is harbor treasure? Why is harbor treasure called harbor treasure? It is used to fix the heel under the heel. The material used is a bit like cardboard. It is hard, but glue is used to fix Gangbao and shoes.

Gangbao is generally divided into the following three types according to the material
1) Leather pulp harbor treasure adopts the method of soaking and softening. This harbor treasure is made of cow leather and insole leather. It was also used to soften leather shoes by hand. At present, Italian leather shoes are trapped in the traditional thinking, and this harbor treasure which is not in line with economic benefits is often used
2) The chemical tablet kongbao is softened by immersion solvent (toluene), which is one of the revolutionary shoe materials in the footwear industry in recent years. Its characteristic is that soaking solvent can be very soft, which is most conducive to the shaping of shoes, without adding or strengthening any treatment, after drying and cooling, it can achieve a stiff effect, and it is widely used in the footwear industry. Advantages: low price, easy shaping. Disadvantages: thicker, long molding time, and the worst elasticity
3) Hot melt rubber harbor treasure ----- adopt heating softening method: use heating (about 100-120 degrees) method to soften the "hot melt rubber" which is pressed in front of the shoes in advance, so as to facilitate the forming of the upper. Advantages: fast, thinner, better elasticity than the general harbor treasure. Disadvantages: the forming is difficult, and the heat degree is not easy to master
In addition, iron chips and other special materials are also used to make climbing shoes and safety shoes