The 03 chair is the grand daddy of $100 plastic chairs, and while it looks like it is maybe a fancy plastic chair it is much more than that, and costs much more as well. While the bright colored molded seat looks like the prototypical plastic chair the 03 is actually much more substantial than a plastic chair. With the heft and weight of a sturdy old oak desk chair the 03 suprises you when you go to sit in it, adjust its position, there is much more mass and momentum than its thin profile suggests. Underlying the seat and back is a heavy steel frame that gives the chair its weight and strength. This is how it presents its thin wafer like profile and yet feels so substantial. The seat and back are molded around the frame with a high density foam. And this is where the chair surprises you again. It is remarkably resilient, with a firm pad like feel when you sit in it. It actually offers much more comfort than an inexpensive plastic chair could ever muster. The back as well gives in the center, sling like, while the entire back flexes much like a task chair albeit the flex is firm and limited.
The 03 chair stacks, and is avaialble in a range of colors - a really excellent design. Vitra also makes several variations including a cantilever sled base, and a full blown task chair with a mobile spider base. The task chair comes in several versions with thicker and softer pads as well.