The ultimate long distance runner, this tire benefits from Continental's durable carbon black mixture, a well regarded puncture protection system and the DuraSkin -anti-cut fabric. In varying widths of 23mm and 25mm, it's a durable, tough tire at a really nice price. Puncture-Proof Winter Tire with Advanced Technologies PolyX Breaker Technology: With its PolyX Breaker, Continental bring PKW know-how to the bike tire arena – 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 to make a very high fabric density, which not only makes the breaker more resistant to foreign objects but also resistant to punctures. The rolling resistance is not affected either by the PolyX Breaker. DuraSkin: Tires with DuraSkin sidewall protection have to roll with the punches. These tires are used in the harshest conditions. On messenger bikes, epic travel bikes crossing continents without wearing through and in professional cycling, tough tests such as Paris-Roubaix. The high-quality polyamide fabric reliably protects the casing of the tire and protects it from the worst conditions. These tires stand out with their brown sidewalls and the slick natural rubber tread is designed to perform well in wet/wintery conditions.