This is why the marathon plus is puncture resistant on the tread:



What i have to wonder is how compressible that blue stuff is.

My kenda kwick trax (26x1.75) has not gotten a puncture since i put it on & i'm not really riding any differently vs my previous set on my old bike which had just had 3 flats in a year on rear and 2 in the front, and those were nimbus something or other.

- Andy