Levi's has partnered with Goodwill to encourage customers to donate their old jeans. Whatever isn't resold through Goodwill will be shipped off to Levi's to be turned into denim insulation. Additionally, Levi's is prompting customers to wash their jeans in cold water and line dry them through a new Care to Air Design Challenge…The challenge "seeks the world's most innovative, covetable, and sustainable air-drying solution for clothing." Think you have the answer? The entry deadline is July 31st and the grand prize is $10,000.