Lightweight: Density is usually 0.12–0.35 g/cm³, especially midsole foam material around 0.15 g/cm³, significantly reducing the weight of shoes.
High elasticity and flexibility: Maintains good pliability even at low temperatures of -50°C, with rubber-like elasticity.
Excellent shock absorption and impact resistance: Closed-cell foam structure provides good shockproof, cushioning, and rebound capabilities.
Wear resistance: Effectively resists wear during daily use.
Chemical resistance: Has good resistance to chemicals such as seawater, oils, acids, and alkalis.
Non-toxic and odorless: Meets safety standards, suitable for insoles, outsoles, and other parts in direct contact with the skin.
Water-resistant and moisture-proof: Suitable for use in humid environments.
Structure and processing characteristics
VA content determines performance: Vinyl acetate (VA) content is generally 5%–40%. The higher the VA content, the greater the transparency, softness, and toughness; conversely, it is closer to polyethylene with increased rigidity and wear resistance.
Easy to process and mold: Can be efficiently produced through processes such as hot pressing, injection molding, and foaming (e.g., EVA injection machines), supporting intelligent manufacturing technologies like 3D printing.
Combinable and modifiable: Often combined with materials such as TPU and rubber to form innovative structures like dual-density midsoles; can also add functional additives like antibacterial agents and flame retardants.