That is a good point MichaelW. On my commuter bike I had some inexpensive 700x28 Continental Sports that I recently replaced with Specialized Armadillo 700x28, strictly for the Kevlar belt. I could not believe the difference in cross section. The Specialized lays down a big wide, flat footprint probably as big as a 35 mm tire, or larger. The Continentals were more rounded and gave the impression of riding on a footprint just a few mm wide. I am thinking seriously of putting them back on or at least getting a similar Continental tire with Kevlar belting. In several spots on my commute I am not able to avoid all the usual urban street debris, especially little shards of broken glass so doing all I can to prevent flats is a high priority.