Delivering consistent all weather performance and reliable security and grip the continental 700c x 25c grand prix 4 season duraskin vectran folding tyre is the only choice you can make the ultra fine polyamide casing gives supple all day performance whilst the maxgrip silica tread compound grips to the ground and is optimised for wet weatherr r extra protection is gained through duraskin polyamide mesh layer on the sidewalls protecting against punctures and abrasions which works in uniso