The Application of Anti-Yellowing Agents in High-Performance Polyurethane Footwear Components Introduction 🧪 In the world of footwear, especially high-performance athletic and outdoor shoes, polyurethane (PU) has become a superstar material. Known for its flexibility, durability, and comfort, PU is widely used in soles, midsoles, and even upper components. But like every hero, it has its...