Under Armour Women's Ua Micro G(tm) Optimum Synthetic-and-mesh Upper: Super-breathable mesh upper with synthetic toecap detail for extra durability Seamless semi-bootie tongue construction helps eliminate slippage and chafing Midsole: Full-length Micro G midsole creates an incredibly lightweight and responsive ride Footbed: Molded 4D Foam footbed conforms to your foot's exact shape, eliminating slippage Outsole: Durable blown rubber outsole for the perfect blend of durability and traction