- 100% cowhide leather - soft sole - elasticated ankle - encourage learning to walk - these slippers tell a story On a light grey-blue background... In our “voyages of yesteryear” collection, here is a little aviator who is very happy to fly high in the sky! The upper of the slipper is made of cowhide leather and the sole is made of suede (returned leather). Each pair of soft leather slippers comes in a natural, reusable burlap bag. Our slippers are quite large, so they can easily be slipped over a onesie or a large pair of wool socks in winter...