Genuine sheepskin is a natural hide with the wool still attached, providing superior thermal insulation. Buyers should check the backing of the material; real sheepskin has a leather underside, whereas synthetic versions use a woven fabric base. Additionally, perform a burn test on a small sample: natural wool will smell like burning hair and turn to ash, while synthetic fibers will melt and smell like plastic. Ensure the supplier specifies if the product is 'Double-Face' sheepskin, which is the highest quality where the leather and wool are one single layer.