Under Armour Womens Micro G Spine Evo, White/Purple/Natural, 7 B Synthetic-and-mesh Upper: Light weight mesh for enhanced breathability Seamless overlays provide comfort and support Midsole: Full length Micro G internal foam provides ultra lightweight and responsive ride The Spine Chassis provides the ultimate in lightweight structure Footbed: Die cut 4D Foam sock liner conforms to your foot's exact shape