The percentage of the mentioned materials is at least 25-50%. The super light sole of the Space Hippies is made of recycled foam. On top of this, there is a 15% share of Nike rubber leftovers that are created during the manufacturing of other products. This gives the sole the famous Speckled look and also benefits the environment. With the Nike Space Hippie Sneakers Nike takes another step towards a carbon neutral and waste-free company.