Under Armour Men's UA Spine Vice Running Shoes Synthetic UA Spine&trade; chassis technology creates an incredibly light, flexible feel without sacrificing support Micro G&#174; foam encapsulated within the chassis delivers unrivaled rebound and energy return Breathable mesh upper with an underlying MPZ&reg; structure for protection and lightweight support TPU heel counter for greater stability without being too rigid for comfort Full length molded 4D Foam&reg; sockliner and collar conform to your foot's exact shape, eliminating slippage