Featuring a shoe upper on a sandal bottom, they combine the year-round style and protection of a shoe with natural comfort. The loose upper allows your foot to spread so it can absorb shock naturally. This strengthens the small muscles that support your arch and encourages you to walk correctly. Sorry if there's no springs, coils, pumps or air bags, but after walking naturally you won't want to wear anything else.
But then again, what do we know? We're just a bunch of surfers in sandals.
sanuk.com for more info.