Stability. Designed for focused runners who want added pronation control and stability, the Karhu Strong 4 offers plenty of comfort and performance. Karhu's Fulcrum technology keeps your foot centered and stable so you can worry less about your form and more about your workout.

Upper: Asymmetric upper with clear medial and lateral shoring supported by welded side reinforcements. Anatomically mapped tongue protects from lace bite without interfering with fit. Moisture wicking collar liner for a comfortable internal environment. Welded, reinforced heel, mid foot, and toe tip reinforcements.

Midsole: Precision engineered compression molded EVA midsole with tuned durometer for ultimate forward efficiency. Firm EVA fulcrum protects from overpronation through support and torsional rigidity without slowing down in the stance phase. Anatomically designed, elastic EVA forefoot insert with hourglass shape aligned to the metatarsal heads for support and cushioning during the propulsion phase. EVA padded lasting board. Removable two piece insole combines molded EVA and PU.

Outsole: Asymmetrical outsole with enlarged medial landing zone for more stability upon initial ground contact and during mid stance phase. Combination compression molded and blown rubber outsole with full ground contact sole and center deflection channels for great traction and comfort.