Founded in 1996 by former University of Maryland football player Kevin Plank, Under Armour - Grapevine Mills is the originator of performance apparel - gear engineered to keep athletes cool, dry or light throughout the course of the game, practice or workout. The technology behind Under Armour - Grapevine Mills's diverse product assortment for men, women or youth is complex, but the program for reaping the benefits is simple: wear HeatGear when it's hot, ColdGear when it's cold, or AllSeasonGear between the extremes.