When sourcing from a Tabi shoe factory, prioritize material authenticity and construction integrity. For traditional styles, ensure the use of 100% heavy-duty cotton canvas and reinforced rubber outsoles with high slip resistance. For fashion-forward leather Tabi, verify the use of full-grain or top-grain leather to ensure durability and flexibility at the split-toe joint. Pay close attention to the 'Kohaze' (traditional metal clasps); high-quality factories use brass or stainless steel with adjustable width settings to accommodate different calf sizes.