When sourcing white label footwear, you must prioritize material quality and construction methods. For the upper, specify whether you require genuine leather, high-grade PU, or breathable fly-knit mesh. Ensure the outsole is made of slip-resistant rubber or lightweight EVA depending on the shoe type. Pay close attention to the lasting process (how the shoe is shaped) and the bonding strength of the adhesive to prevent sole separation. For athletic shoes, verify the midsole cushioning technology, such as air pockets or high-density foam, to ensure performance standards are met.