Got this new pair of Sketchers Rubicon hiking shoes in brown, and the uppers seem to be made from oiled leather. I have never had oiled leather shoes (only nubuck), how should I take care of them? The Sketchers website listing (http://www.skechers.com/style/62392/rubicon/brn) says to "apply a waterproofing spray to leather before wearing in wet conditions"? I have some Woly Protector spray, will it work? What confuses me a bit is that if these are indeed oiled leather, wouldn't simply leather oil suffice for treatment? Perhaps the spary thing refers to the lower upper and heel area which looks a bit different from the oiled upper (which is shiny). These look more like nubuck really?