I bought them because of the Kevlar strip. But a 7 mile ride yesterday and about 25 yards of which was on dirt proved to be too much. The Kevlar strip is about .5" wide right on top. A little thorn enter just outside of it. Fortunely for me Performance Bike has a 100% satisfactory policy. They told me to box them up with a letter describing the problem and they would exchange, refund or replace. I'm choosing the refund. I'm probably going to get the Specialized Armadillo Nimbus. I have a set of Armadillo Spankies on my BMXer. I've riden that thing through thorn patchs just to see how it tough the Dillis really are. 30 miles of tough trail rides later I'm still trying to see what will go through them.

http://www.specialized.com/SBCEqProd...d0hlgb9.j27006

http://www.panaracer.com/05lineup/ur...rban_2.html#um