When sourcing fabric for car seats, durability and safety are paramount. You must prioritize Abrasion Resistance, typically measured by the Martindale test (minimum 30,000-50,000 rubs) for automotive grade. Additionally, Color Fastness to Light is critical; ensure the fabric meets Grade 4 or higher on the Blue Wool Scale to prevent fading under intense UV exposure. For comfort, verify the Breathability and Moisture Permeability ratings, especially for synthetic leathers or high-density polyesters.