Woodzies are made from one solid piece of wood, and lined with a ring of cork to help your beverage keep cool and finished with non toxic polymerized linseed oil. Unlike other koozies, this is made of wood. Wood from the forest of New England. As a matter of fact, it is made from wood from our forest. We fell the trees, mill the wood, and have it specially kiln dried. It does not contain toxic petroleum products. It is guaranteed to give you that warm fuzzy feeling every time you slide your favorite brew into it.