A Fleece Blanket is an insulating blanket made of a synthetic fabric blend. The term fleece often causes confusion, because it is sometimes used to describe part of the wool of sheep. In this context, however, it refers to a specific polyester fabric with no wool content whatsoever. Since fleece gives off a warm feeling, itâs certainly is one of the best materials to use for blankets. It is soft and comfortable, retains heat well, and is light enough to be carried on backpacking trips or stored away easily in a closet. The Fleece Blanket is very easy to maintain and use.