The problem with pneumatic tire systems, whether tube or tubeless, is that they act like air springs. They bounce and deflect off obstacles because they provide no damping of compression or rebound forces.
CushCore® (Patent Pending) is an engineered foam insert that mounts inside a mountain bike tire. It divides the inside of the tire in half with air directly underneath the tread, and the CushCore insert next to the rim. They work together as a spring and damper – In other words an Inner-Tire Suspension System®.