Children lining the route of the athletes parade through the Olympic Park are being advised to wear "comfortable, unbranded or Adidas shoes".
So why is such attention being paid by the nike blazers men low sale organisers of the London 2012 Games to the brand of footwear being worn by participants of the opening ceremony?
Part of the answer lies in the fear of "ambush marketing" - an attempt by non-sponsors to cash in on an association with the Olympics without putting anything in themselves.
Lots of sporting events have been used by businesses to promote their brand using eye-catching gimmicks.
The authorities say they are ready for anything at the 2012 Games, but have stressed that spectators will not be ordered to change if they are wearing the "wrong brand" of T-shirt.
Yet looking for cheap lebron 11 one group representing small businesses describes the rules as "over zealous".