It's the first all-German Champions League final ever - Bayern Munich vs Borussia Dortmund. But they're not the only ones limbering up for a battle. German sportswear makers Adidas and Puma will be renewing their decades-old rivalry. Adidas is the long-standing kit supplier to Bayern and owns a stake of around nine percent in the club, while Puma became the sportswear partner of Dortmund a year ago. But Adidas CEO Herbert Hainer insists it's healthy competition.