Welcome to the latest episode of the Full-Court Finance podcast from Zacks Investment Research. This week we explore Under Armour's ( UAA - Free Report ) Q4 results and look to the company's future, which seems highly uncertain amid stiff competition and shifting sports retail trends. Coming off the company's dismal third quarter, Under Armour's North American sales dipped once again during the vital holiday shopping period. The sportswear company also posted a quarterly loss, based largely on impacts from the new Republican tax law as well as its own restructuring plan.