Under Armour is opening a 15,000-square-foot Brand House in Madison, Wisconsin. The company is also reportedly going to open its first Brand House in Boston in November. With a size of 18,000 square feet, it would be second in size only to its flagship in Chicago, which measures 30,000 sqft. As of last Dec. 31, UA had 30 Brand House stores and 161 Factory House outlets in operation.