UPPER 8 panel upper, made of technical 1.6mm microfiber combined with a layer of perforated and breath-able TPU for strength and abrasion resistance. Alcantara big toe panel. INSOLE The TPS midsole gives support on small footholds without sacrificing sensitivity and the PCB system maintains integral tension across the arch of the foot. ACTIVE RANDING The PAF System is an innovative heel system that helps both spread the force of the heel tension and increase the fit of the heel. The SRT System wraps the forefoot in M50 rubber providing a perfect fit that follows the foot with every movement.SOLE Vibram® 3.5 mm XS Grip 2 pad in the forefoot and around the heel offers maximum friction and stability.