adidas Adistar ESM Boost Women's Running Shoes ** NEW ** Energy Capsule Boost Heel Unit - Every step becomes charged as the Boost midsole absorbs some of the energy from your footstrike and charges it into forward momentum. ** NEW ** TechFit Upper Support - The seamless upper is supported by TechFit material, which offers you a flexible yet secure feel around your entire foot. Flexible Textile Upper - The textile upper is lightweight and is able to adjust to the shape of your own foot ensuring a comfortable fit. Welded Synthetic Overlays - Enhances the fit and strength of the upper and helps decrease upper weight further. External Heel Counter - For a snug heel fit and comfort in motion with enhanced support and stability.