The choice of outsole material is crucial when selecting footwear. PU (polyurethane), TPU (thermoplastic polyurethane), EVA (ethylene-vinyl acetate copolymer), and rubber are four common outsole materials. Each has its own characteristics, and here are some of the main differences between these four materials
Material Properties
PU: A synthetic material synthesized from polyols and isocyanates, known for its good abrasion resistance and elasticity.
TPU: A thermoplastic elastomer made from a blend of hard plastic and soft rubber, offering both rigidity and flexibility.
EVA: A foamed material copolymerized from ethylene and vinyl acetate, lightweight and with good cushioning performance.
Rubber: A natural material extracted from rubber tree latex, known for its excellent abrasion resistance and grip.
Durability
Rubber outsoles are typically more durable than PU, TPU, and EVA outsoles, capable of withstanding more wear without cracking or breaking.
Traction
For traction，rubber outsoles provide better traction on slippery or smooth surfaces, with their rougher surface better able to grip the ground.
Comfort
Firstly，EVA outsoles are usually the most comfortable among the four, as they are soft and flexible, making them more comfortable for long periods of wear. PU and TPU outsoles are also comfortable but not as much as EVA. Rubber outsoles may be comfortable but are usually harder and less flexible.
Weight
EVA outsoles are the lightest among the four, followed by PU and TPU outsoles. Rubber outsoles are the heaviest.
Cost
EVA outsoles are typically the cheapest among the four, followed by PU and TPU outsoles. But rubber outsoles are the most expensive.
Choosing Advice
In conclusion, the choice between different outsole materials depends on your personal preferences and needs. If you value comfort and lightweight, EVA might be the better choice. If you need durable outsoles with good traction, rubber might be the better option. If you want a balance between comfort, durability, and cost, PU or TPU might be the better choices.