Zeal provides a stable but soft heel grip, which is an impossible combo made possible through the molded midsole cradle on the interior side of the shoe. The midsole not only adds superb fit, it also turns into the reinforcement protecting the foot in serious terrain. The height of the heel cup is slightly reduced at centre back in order to reduce the pressure at the Achilles tendon. The medium last is half lined with Quick dry mesh. The torsion and cushioning is in fine balance and together with the low sole profile the ground control is just outstanding. The outsole is made of RB9X rubber, the benchmark among sticky rubbers!