You know that guy at the shoe store who goes into the backroom and brings out different sizes for you to try? That's Zappos. You find the shoe you like. Then

You know that guy at the shoe store who goes into the backroom and brings out different sizes for you to try? That's Zappos. You find the shoe you like. Then you tell "him" the most probable sizes. They send them out to you for free (with competitive base prices). Then you send back the ones, also free with printable label, that didn't fit. It's actually easier than the shoe store, because they come to your door, and with a better selection. The only cost is the two-day wait.