Under Armour Women's UA Micro G Spine Evo Running Shoe Synthetic Lightweight mesh upper with seamless overlays for extra durability and support Unique UA Spine chassis delivers the ultimate in lightweight structure mile after mile Full-length Micro G&reg; foam midsole creates an incredibly lightweight and responsive ride Die cut 4D Foam&reg; sock liner conforms to your foot for customized fit Solid rubber outsole delivers the perfect balance of traction and durability