Our first to recieve our SUSTAINABLE rating, the Generation ZERØGRAND II is created from the ground up using materials made from nature. This versatile style is designed with a minimum of 25% naturally derived or recycled content by weight and features our patent pending FlowerFoam™ sole. Made with dandelions. Yes, dandelions, our FlowerFoam™ sole is created from a minimum of 25% natural dandelion rubber and provides all the lightweight cushioning to keeping you going and growing all day, every day.