The CrossMark is the dramatic evolution of the cross country racing tyre. The nearly continuous center ridge flies on hardpack, yet has enough spacing to grab wet roots and rocks. The slightly raised ridge of side knobs offers cornering precision never before seen on a tire this fast. EXO Protection is an extremely cut-resistant and abrasion-resistant material added to the sidewalls of select mountain tires. Choose EXO Protection for exceptionally rocky, treacherous trails where the chance of sidewall cuts and abrasions is high.