When sourcing wholesale car parking shades, the choice of fabric and frame is critical. You should prioritize High-Density Polyethylene (HDPE) for knitted shade nets or PVC-coated polyester for waterproof tensile structures. Ensure the fabric has a UV protection rating of at least 95% and a weight of 280-340 GSM for long-term outdoor exposure. For the structure, specify hot-dip galvanized steel or powder-coated aluminum alloy to prevent rust and corrosion, especially in coastal or high-humidity environments.