Polyester DIMENSIONS - Our King size Box Cover will mesure 78" X 80". Fits Box Springs with a depth of 4-12", Use Elastic Straps included to prevent slipping. EASY ON/OFF - No need to adjust a Bed Skirt every morning, The Box Spring Cover includes 4 elastic straps with 4 different options to keep box spring in place, this will increase your productivity and save you time at work compared to a bed skirt. STRETCHY FABRIC & DURABLE - Made from Strong Microfiber Polyester yarns and Spandex to last for years of use, 96 percent Polyester, 4 percent Spandex MODERN SLEEK LOOK - Great Alternative to Bed Skirts , designed specifically to cover your Box Spring and not cover your bedframe like a traditional Bed Skirt, Leaves space between your bed and bedroom floor EASY CARE - Machine Wash Cold on Gentle Cycle, Tumble Dry low, Wash Dark Colors Separately, Only use Non-Chlorine Bleach when needed, Wrinkle Free,