It's been known for a few months now that Peyton Manning is no longer a Reebok-sponsored athlete. Manning reportedly left Reebok back in April, but it's unknown what brand he represents now.
https://twitter.com/DarrenHeitner/status/461182137140772864
Manning was seen a couple times during the offseason wearing Under Armour apparel. He and his brother, Eli, were both signed to Reebok. However, both were seen rocking Under Armour recently.
But like the NFL moving on from Reebok to Nike, the Denver Broncos quarterback might have just done the same. Manning was seen at the team's training camp practice rocking Nike cleats.
https://twitter.com/darrenrovell/statuses/493816480249548800
Here's another photo of Manning rocking the swoosh:
Eli, however, is still rocking Under Armour:
Hopefully we get some official word on this soon.