When sourcing textiles, you must prioritize technical parameters that define durability and performance. Key metrics include GSM (Grams per Square Meter), which determines the fabric's weight and thickness, and Thread Count, essential for cotton-based materials. For synthetic fabrics like polyester, check the Denier (D) rating. Always request Colorfastness test reports (ISO 105-B02) to ensure the dye does not bleed or fade, and verify the Martindale Abrasion Test results if the fabric is intended for upholstery or heavy-duty use to ensure it meets a minimum of 20,000 to 30,000 rubs.