Why protect the astronomical dreams of every child? 6-12 years old is often referred to as the 'astronomically sensitive period'. Children begin to feel something real but ethereal, that is, universe and science. Stimulate children's curiosity and imagination. Children's knowledge of the cosmic can bring joy and arouse great interest in studying other knowledge. Broaden children's horizons. Astronomical knowledge can help children understand the large-seated laws of the world's operations, broaden their horizons, and enhance the depth and breadth of cognition. Features: Material: Microfiber Polyester. Soft, breathable and comfortable. Washing & Cleaning: Machine washable in cold water and tumble dry on low. About Size: Twin Size: 1 Duvet Cover 59"x82", 1 Fitted Sheet 63"x91", 2 pillow sham 19"x29". Queen Size: 1 Duvet Cover 79"x88", 1 Fitted Sheet 91"x91", 2 pillow sham 19"x29". Nice tips: To protect the sheet, please use water with a temperature below 30 degrees.