Old Friend Footwear uses 100% genuine sheepskin linings in all footwear that is described as sheepskin. Genuine sheepskin provides many benefits compared to synthetics. Genuine sheepskin is natural, not man made. It offers superior comfort compared to synthetic materials. The hollow wool fibers are naturally breathable and wicks moisture away from the foot. Sheepskin is a natural insulator and is longer wearing and durable than synthetic materials.