The continental grandprix 4 season 700c tyre top level racing clincher with exceptional winter and wet condition performance with a duraskinreg cut resistant layer from bead to bead and 2 extra vectran breakers help increase puncture protection thanks to its duraskin anti tear fabric the grand prix 4 season holds up under extreme conditions in the paris roubaix race the hell of the north cyclists equipped with duraskin enhanced tyres have the fewest tyre related problems during