adidas Adistar Boost ESM Running Shoes are made with boost? technology to keep every step charged and help you smash your PBs. The engineered techfit® upper provides natural, flexible support with a snug and comfortable fit. The full boost? midsole keeps each step charged with ultra-light and quick energy and the Adiwear outsole offer long-lasting traction and durability. A Torsion® System ensures midfoot integrity while the heel clip keeps the fit locked down. - A.D. Key Features: boost? foam keep..