1. At the end of polyurethane (PU) :Polyurethane is short for polyurethane, English name is polyurethane, it is A kind of polymer material, by the A/B/C polyester foam material, oil and water two kinds. Is a new kind of organic polymer materials, has been hailed as "the fifth big plastic", used in the manufacture of high-grade leather shoes, sports shoes, travel shoes, etc.Advantages: low density, texture is soft, good elasticity, wear comfortable light; Good oxidation resistance, excellent wear resistance, bending resistance, high hardness; Good shock absorption, prevent slippery performance; Good heat resistance performance; Good chemical resistance; Easy corrosion conducive to environmental protection, is not easy to fold.Disadvantages: water imbibition is strong, easy to yellowing, easy to fracture, elongation rate, water resistant, perishable, permeability is poor.2. The leather sole:Leather shoes is a kind of can automatically respiration and drive the foot soles, permeability is good, not stuffy feet, can automatically release absorb sweat to keep feet dry. Is given priority to with cowhide leather sole, the price is higher. Its advantage is easy to settle, not to distort, fit, good elasticity, can reduce the impact and less prone to fatigue, ventilation, moisture absorption, easy processing, at the same time type easy to show beauty. Hard not pierced, but before and after soaking by water, oil easily warping deformation or decay. Its main features:(1) have better heat insulation ensure the right temperature in the feet in the shoes(2) light weight, the weight of per square centimeter in 0.95 ~ 1.05 g, and water density is the same. Can be waterproof and shoes are no longer in the damp when releasing moisture, guarantee the shoes is in a state of comfort.(3) unique three-dimensional fiber structure, sole in the 180 - degree bend without breaking. Can quickly adapt to the feet, can effectively support the ground impact, more effective than other materials same thickness sole trap spats.3. The EVA base:Ethylene Vinyl Acetate - Vinyl Acetate copolymer, polymer materials. Used to jog, walk, casual shoes, foot in the shoe bottom. Qualitative light, easy to machining, not wear-resisting, oil resistant.Advantages: lightweight, good elasticity, flexibility is good, not easy to wrinkle, has excellent color, suitable for all kinds of weather.Disadvantages: easy to water absorption, not easy corrosion adverse environmental protection, easy to dirty.4. The MD base:MODEL or PHYLON dragon collectively, EVA secondary high pressure FRP products. End of MD sole inside must contain EVA, MD, also called PHYLON bottom. Such as MD = EVA + RB or EVA + RB + TPR and some shoes is RB + PU, etc.Advantages: lightweight, flexible, fine appearance, good softness; Easy to clean; Hardness, density, tensile, tear, elongation.Disadvantages: not easy corrosion adverse environmental protection, high temperature easy to wrinkle, easy to contract; Poor durability, use a long time will reduce the shock absorption force, less porous.5. Rubber soles (RB) :The abbreviation of RB is English rubber (rubber); Hot compression molding, natural rubber and reclaimed rubber. Heavy, oil resistant, molding bottom must be in the joint surface coarse grinding, easy to shorten the heating, color is not consistent.Advantages: good wear resistance, and antiskid, elastic, not easy fracture, flexibility is good, good expandability and shrinkage stability, hardness, bending and waterproof.Disadvantages: heavy, easy to spit the frost (quality problem), not easy corrosion (environmental protection); Not hard, easy to be pierced through; Bad air permeability, hygroscopicity, afraid of oil immersion, should not be in the filling station in contact, such as oil.Does the rubber foamWeighs less than rubber soles, rubber, on time, with finger surface rebound than ordinary sole, wear-resisting performance is poor.Does high pressure polyethylene rubber solesFlavour ingredient of high pressure polyethylene and rubber sole, rubber and plastics.Raw rubber, quality, and the heavier and more expensive, oil resistant, no heat. Easy to change color.