RSI™ Colored 50% Polypropylene Knitted Shade ClothDESCRIPTION The Riverstone line of custom made 3 Season Shade Cloths is designed to offer easy to use, shade producing cloth that is UV stable and will last for several years in the hottest environments. All BLUE 3 season shade clothes protect at a 50% level. All our knitted shade clothes are proudly made from blue polypropylene strands with black edging and brass grommets in the USA. Each shade cloth comes with brass grommets for securing the shade