What happens to the product Nike when it wears out?

With a lot of nike products (espically the rubber soles from their tennis shoes) they recycyle the rubber soles and turn them into usful sports equipment. I know for a fact that with the soles, they grind them into tiny pieces or rubber and then use the ground rubber soles to make tracks for local track and field fields. The soft springy rubber track is actually amazing to run on. Also, if the shoes are not in too bad of shape (i.e. soles are worn but the shoes is in decent shape) Nike will donate the shoes to people in need (homeless, poor, third world country inhabitants, etc)