When sourcing shoes, you must prioritize material quality and construction methods. For the upper, distinguish between Full-Grain Leather, PU (Synthetic), and Fly-knit fabrics based on your target market's price point. Ensure the outsole material (e.g., Rubber, EVA, or TPU) meets specific slip-resistance and abrasion standards. Additionally, verify the lasting method (cemented vs. Goodyear welted) to ensure the structural integrity matches the intended usage scenario, whether for casual wear or heavy-duty work.