Though difficult for most of us to even imagine, it's a reality for tens of millions of impoverished kids around the world: living every day without shoes on your feet. In India, it's shockingly common to see shoeless infants and toddlers, an obvious health risk that can lead to infections like hookworm and even elephantiasis.

Shoes should never be a luxury, and two young athletes living in Mumbai have decided to do something about it. Their company Green Sole converts old shoes into new footwear, and distributes it to Indian schoolchildren. And they're not alone: an entire category of companies in India has sprung up around repurposing old materials into new products.

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