It's made of a new elastomer that allows the back support to flex and fit into your back in a much softer and unconventional way (it's been used as a hinge in dishwashers). It debuted at NeoCon just last month and won gold. It just went on sale two weeks ago, but won't be available online until Friday
BTW, this is not a paid product plug. I just like reviewing task chairs... :-)

While I haven't Test Labbed it yet, the back is way different and much more conference-friendly chair in that it allows you to turn around and talk to people easily (the back even folds over). It doesn't have the tall back or the "command seat" mentality. This is more of a comfortable, sit-any-way-you-want, slacker chair with style. I'm waiting for a sample that we can all test here in the office, and I'll give you our rating as soon as we're done. Let the task chair wars continue!
>> SitHowYouWant.com is Knoll's Generation Chair Minisite






Apartment Therapy Task Chair Posts
>> Herman Miller Embody Chair in the Test Lab
>> Steelcase Leap Chair in the Test Lab
>> Workbay Task Chair by the Bouroullec Brothers