The adidas Adistar BYD takes the dual-density REPETITOR+ midsole of the original, designed for a steady run over long distances, and adds some of their pinnacle race day tech in the shape of the lightweight and responsive Lightstrike Pro cushioning. They have also added a carbon injected plate to help drive you forward efficiently. A continental rubber outsole provides excellent traction in both wet and dry conditions, letting you put down the extra speed with confidence.