the market leader among road bikers for puncture protection and great service life the reptilian design sets the tone for eating up those miles! excellent puncture protection thanks to PolyX BreakerA(R) puncture protection insert extremely long service life through wear-optimized tread compound With our PolyX BreakerA(R), Continental brings their car expertise to the bicycle tire segment: Polyester has been used successfully for years in car tires and been tried and tested many times. The extremely resistant polyester fiber is woven tightly crosswise. In this way, a very high fabric density is reached which not only makes the Breaker more resistant to foreign objects but is also especially resistant to punctures. The rolling resistance is also not negatively affected by the PolyX BreakerA(R).