Tension springs made of high-tech material that provides the spring effect through compression resistance, as part of the innovative patented Impact Protection System (IPS). Can be adapted to the weight of the user by cutting off bands when softer compression resistance is required. Coil Springs can be added for additional intensity. Includes 4 TwinTurbos for increased comfort, rebound & stability. Attaches to the Shells thanks to the innovative SRS (Safety Release System), a double way safety system that can lock the shells in place for extreme uses.