When sourcing sunshades, you must prioritize material durability and weather resistance. Look for high-density polyethylene (HDPE) or UV-stabilized polyester fabrics with a UV protection rate of at least 95%. For retractable or mechanical systems, ensure the frames are made of powder-coated aluminum alloy to prevent rust and corrosion in humid or coastal environments. Additionally, verify the wind resistance rating, typically requiring stability in winds up to Beaufort scale 6-7 for commercial outdoor installations.