Fizik Road Saddles Terra ArgoA combination of a ride compliant, carbonreinforced nylon shell and a Kium hollow rail with a high strength to weight ratio The shell's side edges flex and adapt to a rider's inner leg movement LONG DISTANCE COMFORT The padding is made from fiziks proprietary Type 2 foam formulation, slightly thicker around the ischial sit bones area to support a more upright riding posture. The cushioning is slightly softer and more progressive than the type we use