Weight: 6.8 oz * 1:1 Seamless Upper creates an unparalleled fit with a seam-free interior * 1:1 360? Lacing anatomically conforms to the foot for a tailored fit regardless of foot shape * NEW 1:1 Energy Foam cushions the forefoot upon impact and then returns energy back to the runner * Outsole-grade EVA and blown rubber outsole combines for great cushioning and weight savings