Give back to the environment and GO GREEN with with the Simple Satire eco sneaks. These shoes are made out of everything recycled and organic. The bottom of these shoes used to be tires that rolled around on an axle that was connected to a car. Given the inherent nature of use like this, some of the shoe bottoms (i.e. tires) are marked up a little. Sure, we buff them out and put them on the bottom of the shoes, but they still show wear. Recycled plastic bottles are collected to create PET (polyethyleneterephthalate).