To keep your sled running smoothly and your rails firing on all cylinders, strap on Ski-Doo Rail Reinforcements. They’ll help alleviate wear and tear, bends, or damage to your rails, and keep you riding longer and better. Can replace stock stiffener on the Freeride model. Snow Contact Function Increases rail strength and longevity. Materials & Wear Parts Lightweight cast aluminum construction. Compatibility Can replace stock stiffner on Freeride.