For the record, the puncture protection belt on the Ultremo tires is actually quite effective, but it's pretty narrow and mostly covers the center rolling contact patch. The belt is a very densely woven Vectran material which is lightweight and has minimal effect on rolling resistance.

Here's a quick blurb that Bike Hugger blog posted a few years back.

http://bikehugger.com/post/view/ultremo-destructo