The GravelKing AC (MUD) with an aggressive tread pattern is designed for riding in tough conditions, on unpaved and muddy roads. The ideal choice when you don't want to worry about whether it's dry, wet or which way to go. ZSG Natural Compound technology creates a softer compound that is overlaid on the outside with a harder compound for increased durability. AX-Alphacord technology uses the highest density, flattest fibers possible for flexibility, lightness and increased puncture resistance. This durability is further enhanced by the Anti FlatCasing coating across the entire surface of the tire, which again increases puncture protection.