There are so many kinds of shoes sole developed already, and they have quite different characteristics. 1. leather soles Soles, leather soles can automatically breathe and drive the foot breathe good air permeability, not stuffy feet, able to automatically release the absorbed sweat to keep feet dry. Leather soles to leather-based, higher prices. The advantage of easy stereotypes, the same type, fit, good elasticity, can reduce the impact of fatigue, and at the same time easy processing, easy to show the beauty of type. 2. rubber sole (RB) RB is the abbreviation of the the English rubber (rubber); hot press molding, sub-natural rubber and recycled rubber. Advantages: good wear resistance, non-slip, good flexibility, good extended contraction stability, good hardness, bending, waterproof. Disadvantages: heavy, hard, easily spike; permeability, bad hygroscopicity, fear of oil soaked, contact with oil should not be in the automobile service stations, etc. places to wear. 3. Polyurethane bottom (PU) Polyurethane, which is a polymer material, divided into two kinds of oil-based and water-based foam. It is a new kind of organic polymer materials, known as the “fifth largest plastic”, used for the manufacture of high-grade leather shoes, sports shoes, sneakers. Advantages: low density, soft, flexible, comfortable and easy to wear; good resistance to oxidation, excellent wear resistance, resistance to bending performance, high hardness; excellent shock absorption, slip resistance; better temperature performance ; good chemical resistance; corrosive environmentally friendly, easy to fold. Disadvantages: absorbent, easy yellowing, easy to break, elongation is poor, not water, at the end of perishable, poor ventilation. 4. EVA bottom Ethylene Vinyl Acetate-vinyl acetate copolymer, a polymer material. Commonly used in jogging, walk, casual shoes, the foot training shoes in the bottom. Light weight, ease of processing, do not wear, not oil resistant. Advantages: lightweight, good elasticity, good flexibility, easy to fold, with excellent coloring, suitable for all kinds of climate. Disadvantages: easy to absorb water, and not likely to corrode or bad for the environment, easy dirty. 5. TPR bottom The TPR could have been a broad generic including TPV, SEBS, SBS, TPO, TPU, EVA and other products. TPR soles mainly refers to the the SBS modified shoe commonly known (belonging to a TPR material application). TPR shoe Compound thermoplastic body SBS-based production of a new polymer shoe materials, the performance of rubber but also by the thermoplastic processing and recycling, with ordinary plastic molding machine, injection molding, extrusion molding. , blow molding made of rubber products. Advantages: easy shaping, cheap; a lightweight, comfortable, high elasticity, easy to stain, good ventilation, high strength, especially excellent low temperature resistance, high coefficient of friction, the clutching and strong. Disadvantages: material weight, wear bad (not wear), poor flexibility, poor bending (not folding), shock-absorbing ability, poor ventilation. 6. TPU bottom Partial thermoplastic polyurethane elastomer (Thermoplastic Polyurethane), it is a new environmentally friendly materials. Advantages: have excellent mechanical strength, abrasion resistance, oil resistance and flex resistance, especially abrasion resistance is most prominent, good appearance, and generous upscale. Disadvantages: heat resistance, hot water resistance, resistance to compression is poor, easy to turn yellow appearance, processing easy to stick mold, hard, heavy, poor ventilation. 7. PVC bottom PVC polyvinyl Chloride, qualities of light yellow translucent and shiny. Advantages: most of the cheaper, oil resistance, abrasion resistance, good insulation properties. Disadvantages: non-slip performance is poor, poor texture, not folding, poor ventilation. Source:https://www.morevafoam.com/knowledge-base/shoes-sole-classification-and-characteristics