Why are TOMS Shoes so special?

I'm intrigued by the popularity of TOMS Shoes and their claim to be unique. Can you elaborate on what sets them apart from other shoe brands in the market? Do they use special materials or innovative designs that make them stand out? Additionally, I've heard about their "One for One" giving model, where they donate a pair of shoes to a child in need for every pair purchased. How does this social impact initiative contribute to their brand's specialness and resonate with consumers?