Those materials that in general are made out of rubber, EVA and so on can easily be transformed into padding for surfboards, protections and even add a new line to your flip flop selection.
I believe the process won´t be neither complicated or expensive and you would be able to target a segment of the population that is very sensitive to this problems, the surfers. People that live in nature constantly and appreciate it.
It would be a problem solver for us surfers and would place Nike in our minds as a sustainable brand that cares for the worries of its customers.
Hope it´useful! I am open to any more help or suggestions.