Designed specifically to take all the abuse of cross-country and desert racing, combines a number of unique features: Modified H design is dimpled, providing an additional full 70% more gripping edge for superior traction. Rounded corners assure self-cleaning which eliminates packing and promotes clean-out. Heavy duty polyester cord construction equals a 4 ply rating providing longer wear and puncture resistance. Tubeless construction. Engineered strong yet flexible side walls provide superior traction plus stability.