Which is better, rubber sole or foam sole?

Is the sole foam, plastic or rubber? I have some opinions on this issue after working for eight years.

Sole is actually a very complicated product, generally divided into midsole and outsole, usually cardboard, sponge or non-woven fabric. Let's talk about the outsole. Is the landlord asking about foam, plastic or rubber? I think he's talking about outsole.

One: First of all, foam, the scientific name EVA, can be divided into two types: primary molding and secondary molding. Xtep, Anta, Nike and other running shoes are mostly formed at one time because of the pursuit of lightness and comfort; The following figure

There are many secondary molding, such as various hemp rope soles and various wedge-heeled women's shoes. The advantage of this secondary molding sole is that it is particularly convenient to mold, and it can be made into various thicknesses and shapes, without mold cost. As shown in the following figure, the black inner core sole is EVA secondary molding sole, which can also be called combined sole.

Second; Secondly, plastic, abbreviated as PVC in English, is generally used for middle and low-grade shoes. The price is cheap, but the flexibility is poor.

Third; Rubber is a very common sole material, and its English name is rubber. It can be said that most formal shoes are rubber soles, which have the advantage of wear resistance, but the cost is higher.

Fourth; In addition to the above three, there are polyurethane (PU), wood, hemp, Melaleuca and other sole materials.

Satisfied hope to adopt, thank you!