When sourcing 'No Brand' shoes, you must prioritize material composition and construction integrity. For the upper, specify whether you require Genuine Leather, PU (Polyurethane), or Fly-knit mesh, as these drastically affect price and durability. Ensure the outsole is made of RB (Rubber) or EVA (Ethylene Vinyl Acetate) for slip resistance and cushioning. A critical technical benchmark is the Cold-Flex Resistance, where the sole should withstand at least 30,000-50,000 flexes without cracking. Additionally, verify the bonding strength (glue quality) between the upper and sole to prevent delamination.