KUST Windshield Sun Shade for Mazda 6 2014-2021 Mazda6 Accessories Custom Fit Sunshade Foldable Window Sun Visor Protector Blocks UV Rays Keep Your Car Cooler

I use a custom sunshade from KUST on amazon. Fits very nicely imo, covers the entire windshield and has great heat rejection. Not affiliated, just been using it for a couple years now. https://a.co/d/0hVceKQF