CUSHIONED RUNNING SHOES MADE FOR ULTIMATE ENERGY RETURN. Prototype after prototype. Innovation after innovation. Testing after testing. Meet us in the hot pursuit of the pinnacle harmonization of weight, cushioning, and responsiveness. Ultraboost 21. Say hello to incredible energy return. HIGHLIGHTS: ADIDAS LEP The new Torsion System provides a 15% increase in forefoot bending stiffness for a more responsive run. INCREDIBLE ENERGY RETURN 6% more Boost capsules ready to explode with energy in each step. PRIMEBLUE This product is made with Primeblue, a high-performance recycled material made in part with Parley Ocean Plastic. SPECIFICATIONS: Sock-like fit Lace closure adidas Primeknit+ upper Textile lining Supportive heel counter Boost midsole Weight: 10.9 ounces Midsole drop: 10 mm (heel 30.5 mm / forefoot 20.5 mm) Stretchweb outsole with Continental™ Rubber Primeblue Imported Product color: Ice Purple / Ice Purple / Rose Tone Product code: S23843 adidas Ultraboost 21