Medium arch signature Superfeet shape adds stability and comfort to your shoes, reducing stress on feet, ankles, knees, and back. Improves efficiency, reduces fatigue, and supports every step. Responsive EVOLyte carbon fibre cap and two layers of Aerospring Rebound foam combine to deliver exceptional comfort and smooth and efficient energy transfer through your gait from foot strike to toe off. Made to replace the removable liner in roomy to moderate-fitting shoes. Superfeet Active Support Medium V2 Features: Best For: Running, walking, training, athletic shoes Fits Best In: Roomy to moderate fitting active footwear with removable insoles Arch Height Medium Thickness Max Cushion Semi-Firm Aerospring Rebound Comfort Foam Evolyte Carbon Fibre Stabiliser Cap Moisturewick Top Cover Sculpted Heel Cup