What good are a pair of boots if the cold passes straight from the ground through the sole and to your feet? Sheepskin insoles insulate boots, wellies, and other winter shoes so that your feet stay cozy and warm. Sheepskin is a natural material that consists of leather and wool from sheep. Synthetic materials with a leather-like feel on one side and a soft fuzzy texture on the other side are also sometimes known as sheepskin, but these materials do not have the amazing properties of real wool. Unlike synthetic fleece, wool acts as an insulator even when it is wet. It also wicks moisture away from the body, making it the perfect material for winter shoes. Use your sheepskin insoles to replace the insoles in sheepskin boots, or insert them in any pair of boots for that warm fuzzy feeling you love. eBay has a wide variety of sheepskin insoles from reliable sellers, so you never have to suffer from cold feet again.