anti-yellowing strategies for preventing discoloration in molded polyurethane shoe parts 🧠 introduction: the golden glow that isn’t so golden polyurethane (pu) has long been a darling of the footwear industry, celebrated for its versatility, durability, and comfort. from sleek soles to cushiony midsoles, molded polyurethane parts are ubiquitous in modern shoe design. but even this...