Boost midsole Regular fit Rope lace closure Stretch mesh, woven and ripstop upper Say hello to ultimate energy return. The adidas Ultraboost 21 x Parley Shoes give you more responsiveness in a design that keeps the planet in mind. The upper combines mesh, woven material and ripstop, all sourced from Parley Ocean Plastic. The design evokes the protective look of military gear, a visual representation of our need to protect the oceans.