100% Woven Polyester (Charmuse Satin) Our satin Fitted sheets feel and look smooth, glossy, soft as well, making it very comfortable to sleep on. Even though it may not be silk, it is smooth and warm well on cold nights making it a perfect sleeping surface during all seasons. Satin sheet is the reason for gorgeous silky hair, maintaining hair's nature oils, minimize hair breakage and matting, even when tossing and turning, so hair is less frizzy upon waking than it would be with other fabrics or materials. Satin sheets are gentle against the skin, allow the skin to slide smoothly and so low chance of leading to fine lines and wrinkles over time. Satin bed sheets provide a lavish look and feel. The glossy shimmer creates an elegance appearance. A bedroom can be transformed simply with a set of new satin sheets. Machine wash in cold water. Tumble dry low. Do not bleach. And please keep your pups from scratching the sheet. If your skin is sensitive, we suggest you to wash it before using.