When sourcing, prioritize Genuine Calf Leather or Camel Leather for the upper, as these provide the best balance of breathability and durability. Ensure the insole is made of memory foam or high-density latex covered with soft leather to provide the necessary arch support for traditional flat designs. For the outsole, Polyurethane (PU) or Thermoplastic Rubber (TPR) is recommended for its lightweight and anti-slip properties, which are essential for the hot, arid climates where these sandals are typically worn.