When sourcing car cover fabric, you must prioritize material composition based on the target environment. For UV protection and heat resistance, reflective aluminum film or high-density polyester (210T/300D) with silver coating is essential. For waterproofing, look for fabrics with a PU or PVC coating and a hydrostatic pressure rating of at least 2000mm. To prevent paint scratches, ensure the fabric features a soft non-woven or cotton fleece lining. Additionally, breathability is crucial to prevent condensation and mold; look for fabrics with integrated air vents or microporous membranes.