Designed for extreme rock crawling and desert terrain. Specialized rubber compound help extend tires tread life. 8-ply-rated radial construction, available sizes: 32x10-15 & 35x10-15 Enlarged tread spacing on shoulder to improve traction and slide performance in desert terrain. Stepped shoulder tread block design for better biting edge on rocks, and improve grip and traction during rock climbing. New multi-level sidewall design improves puncture resistance and difficult terrain pass-ability with new appearance.