A narrow heel and a toe box adapted to the women's foot have been completely changed to the unisex version. The soft Vibram VS Grip 2 sole provides the highest sensitivity and most direct feeling for rock or volume. The proven Bi-Tension Randingsystem keeps the shoe on tension from the heel to the tip of the toe and enables a powerful start. Adapting the heel to the narrower foot brings an unprecedented heel hook performance. Bi-TensionBasically, a reverse slingshot rand that's anchored under the critical toe area and connects directly to the heel rand, only there's nothing basic about it. The patent-pending system actively pulls power from the toes, rather than cramming your toes painfully forward, giving immediate performance with less tension. And that means less rubber, making your shoes lighter, more sensitive and more reactive. Vibram XS Grip² This sole is used where pure grip is needed! Shoes with this sole are therefore indispensable for competitions or in overhanging routes.