Selecting the correct material depends on the storage environment. For outdoor use, prioritize multi-layer non-woven fabrics (like SFS or SMS) or high-density Polyester (210D-600D) with a Silver/UV-resistant coating to prevent paint fading. For indoor use, a soft velvet or flannel-lined fabric is essential to prevent surface scratches. If the vehicle is in a high-moisture area, ensure the fabric has breathable pores or vents to allow trapped moisture and heat to escape, preventing mildew and oxidation.