If any more retro shoes are released my head will probably explode. Not likely, but I am super excited that Nike is dipping back into the 70’s running shoe catalog. The Challenger is an updated version of the 60’s waffle running shoe and it comes in a grey/blue colorway. Hopefully there are more of these shoes on the retro horizon. What do you think of the Challenger retro? The rest of the pics after the break.