Three-layer sole construction made of grippy nylon fabric, orthopedic 3D padding, and recycled fiberglass shell. Developed with Solestar, the specialist for 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 brought into a neutral position and help prevent strain on the ligaments, tendons, and joints.