Ultra-light mountain shoe for technical excursions, ideal for via ferrata, trekking, glacier crossings, and varying terrain. The Aequilibrium ST GTX offers maximum comfort thanks to its tongue with integrated bellows construction and the soft snow skirt on the protective collar. Excellent walking characteristics are provided by the innovative Double Heel™ design: the pronounced geometry with a dual construction of the heel enhances braking properties when descending and allows for a smoother rolling motion to protect the muscles. Durability and lightness are perfectly balanced thanks to the new sole/midsole unit with external shell construction Rubber Guard™ and internal foam for increased cushioning and reduced rubber layers. The shape is ergonomic: enveloping and precise, with integrated TPU shells at the toe and heel for reinforcement of the upper material. The 3D Flex System Evo™ with molded ankle support and abrasion-resistant protection enables better step control and perfect ankle mobility. The gaiter for the lacing at the toe protects against abrasion. The midsole is compatible with semi-automatic crampons, and the Vibram® SpringLug Tech outsole with Impact Brake System lugs ensures better adaptation to hard rock surfaces. Mountain climbing in perfect harmony.