A shoe that applies state-of-the-art ergonomics to sustainably sourced materials - The Generation ZEROGRAND II Water-Resistant Ultra, featuring an upper and footbed engineered from recycled materials together with a unit sole made from our proprietary FlowerFoam��? cushioning, a compound that incorporates a minimum of 25 percent dandelion rubber. Water-resistant, mixed and recycled materials upper in Black and Dazzling BlueFlowerFoam��? unit sole made with a minimum of 25 percent dandelion rubberFootbed made from recycled materials