What fabric lasts longest in sun?

Across r/BuyItForLife threads the most-cited durable fabric is Sunbrella acrylic, which holds color far longer than standard polyester. Brand-claimed 'no-fade' fabrics like Midtown's Terylast and Acrylast also draw favorable verified-purchase reviews, while inexpensive polyester canopies are repeatedly described as fading and needing replacement within a few seasons.