Under Armour VX2-Undeniable Backpack 83% Polyester/17% Nylon Imported Where we started? It all started with an idea to build a superior T-shirt The technology behind Under Armour's diverse product assortment for men, women and youth is complex, but the program for reaping the benefits is simple: wear HeatGear when it's hot, ColdGear when it's cold, and AllSeasonGear between the extremes Four interior slip pockets. Four exterior pockets