adidas Pureboost 2 Womens Running Trainers / Shoes - These women's running shoes feature boost in the midsole for endless energy return mile after mile. They feature a techfit upper for a natural fit and an adaptive FORMOTION heel for a smooth heel-strike. boost's energy-returning properties keep every step charged with an endless supply of light, fast energy. techfit upper is engineered for natural, flexible support and a seamless, sock-like fit. Active FORMOTION stretches as your foot moves for a contoured fit. Grippy rubber outsole with increased cushioning.