Care varies by blanket: many list machine wash (cold or gentle cycle) and tumble dry on low or a gentle setting; some recommend line drying or laying flat to dry. A few items specify dry clean only. Several listings advise against bleaching or ironing.
Some stadium-style throws combine a plush fleece lining with a water- and wind-resistant outer shell (note that the plush fleece side itself is not water resistant). They may use a 300D oxford backing and are often designed to roll or fold compactly with a carrying strap for transport.