The Application of Anti-Yellowing Additives for Polyurethane Foam Used in Footwear Introduction 🧡 Polyurethane (PU) foam has become an indispensable material in the footwear industry due to its exceptional comfort, flexibility, and durability. Whether it’s insoles, midsoles, or cushioning layers, PU foam is celebrated for its ability to conform to the shape of the foot...