CushCore is an engineered foam insert to be mounted inside a tire, designed to absorb impacts, reduce vibration and increase lateral stability. These characteristics translate to a more controlled, comfortable, and faster ride. ?FEATURES: The system is designed to be used with tubeless-ready or tubeless converted rims and tires, and is compatible with tubeless tire sealants The insert divides the inner volume of the tire in half, maintaining air underneath the tread and the foam insert next to the rim Valve stem included CushCore XC is a lightweight foam tire insert designed for cross-country racing, light trail riding, and/or less aggressive riders Inserts are designed to absorb impacts, reduce vibration and increase lateral stability Provides a more controlled, comfortable, and faster ride