The more robust solution is a hydro - pneumatic bump shock or air bump. ICON's hydraulic bumpstop uses oil and nitrogen to do two tasks function as a spring and a shock. An internal nitrogen charge is compressed when the air bump is compressed to act as a spring, similar to the OEM bumpstop. The difference is hydraulic air bumps are adjustable and can be tuned to have low impact forces at the beginning of the travel, and ramp theoretically to infinity at the end. Unlike the factory bumpstop, ICON's hydraulic bumpstop incorporates oil along with a damping piston internally to control the amount of energy that is returned to the suspension, reducing the vehicles tendency to kick. The oil and damping piston also control the compression of the air bump relative to speed which is important for Raptors hitting obstacles at extreme speeds.