When sourcing cowhide, you must prioritize thickness (measured in mm or ounces), tanning method, and grade. For footwear and bags, a thickness of 1.2mm to 2.0mm is standard, while upholstery requires 1.0mm to 1.4mm for flexibility. Full-grain leather is the highest quality, retaining the natural grain and durability, whereas top-grain is sanded for a more uniform appearance. Ensure the tanning process (Chrome-tanned vs. Vegetable-tanned) aligns with your product's needs; vegetable-tanned is preferred for eco-friendly luxury goods, while chrome-tanned offers better water resistance and color consistency.