Three-layer sole construction made of grippy nylon fabric, orthopedic 3D padding, and recycled fiberglass shell. Developed with Solestar, the specialist in insoles. IP3 insoles support and stabilize the power flow from the legs, through the feet, directly into the pedals. Solestar inserts ensure that the foot is placed in a neutral position and help prevent strain on ligaments, tendons, and joints.