Croslite? It is a closed-cell resin, which can soften with body temperature and conform to the foot lines. Besides, Cross Park Jung Su? The material can also be breathable, sweat-wicking, anti-slip and antibacterial, and the shoes will not stink. In fact, it is a kind of resin, which is light and has a pungent smell. Whether it is harmful or not is unknown. As for the line that follows the feet, the smell can't be completed, but the temperature. In fact, this is the common feature of all plastic materials, that is, it is deformed by heat.
Do you want to know its chemical composition?
Since this is a patented product, it must be kept secret.