As other have pointed out already, the American Red Cedar is a different species from the Cedars of Lebanon. Red Cedar is a rather cheap and nasty wood, lots of knots and the wild and random streaks of white sapwood running through. It's traditional use in the States was shingles and house cladding. I just picked on the net a picture of red cedar furniture, as well as a chest in cedar of Lebanon and I believe everybody agrees that red cedar not the nicest timber for furniture use. Oak, cherry, walnut, maple are classic furniture woods, red cedar isn't. So, what do you do with a product you have no market for, you invent a market. It really doesn't matter what species of wood a shoe tree is made from, the proper fit is far more important.