When sourcing shoes, you must prioritize material quality and construction methods. For the upper, distinguish between genuine leather (full-grain or top-grain) for premium markets and high-grade PU or microfiber for cost-effective durability. The outsole material is critical; Rubber (RB) offers the best slip resistance and wear resistance, while EVA is preferred for lightweight athletic footwear. Ensure the lasting method (e.g., Goodyear welted, cemented, or injection molded) aligns with your target price point and durability requirements. For safety shoes, verify steel or composite toe caps meet EN ISO 20345 standards.