One of the most puncture resistant tires Schwalbe makes for MTB features connected offset center ribs that provide low rolling resistance and strong outer lugs that dig into the corners. SmartGuard puncture protection is composed of an ultra durable indian rubber 5mm thick belt for resisting all but the largest road and trail debris. Equally suitable for paved path and off road use. DC - Dual Compound tread provides a lower rolling resistance center paired with extra grip for the corners. REF - Reflective sidewall striping or hotpatch to aid in low light visibility