polyurethane - feetkeepers

Why White Sneakers Turn Yellow: The Chemistry Behind the Sole

October 18, 2026

Zapatillas de lona muy gastadas con la suela clara envejecida

Why white sneakers turn yellow: UV light, aromatic polyurethane, antioxidants that oxidize, air pollution and heat inside the box. What the chemistry says, plus a California solar plant that browned.

Vegan Shoes Materials: What’s Actually Inside Cactus, Apple and Mushroom Leather

October 18, 2026

Extracción de fibra de hojas de piña con una máquina descortezadora para fabricar Piñatex

Vegan shoes materials, opened up: what a German lab found inside cactus, grape, apple, pineapple and fungus leathers, the century-old history of fake leather, and why no one can put a number on sustainability.

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