ElleSilk Bronze Silk Blanket, the Highest Grade (6A) Long Fiber Silk, Soft, California King Size We use the highest grade (6A) long fiber mulberry silk which drapes over your body for the ultimate night&#039;s sleep. Available in a wide range of colors, the silk blankets effortlessly complement your bedroom dcor beautifully. Natural, breathable properties of silk enables you to maintain a more stable temperature throughout the night.