This is a Sherpa Blanket, which is a type of reversible fleece throw typically made of polyester. One side usually features a soft fleece, while the reverse is a plush, warm sherpa material.
Material: Generally made from 100% polyester, offering a soft, warm, and durable textile.
Design: The blankets are often available in a plain grey color on the ribbed/flannel side and white on the sherpa reverse side, as shown in the image.
Use: They are described as being soft, thick, and extremely warm, suitable for use on a couch or bed, for both indoor and outdoor use