In the quest of creating the best possible belts for snowmobiles, the Ultimax 3 has evolved into the new Ultimax Pro. The new Pro belt features a thicker cross section so more surface area contacts the clutch. This means less slippage over a broader speed range for quicker acceleration. The new cog design dissipates more heat and maintains flexibility. Cooler running belts mean longer lasting belts and better performance for your snowmobile. Run cool, run long, run fast with Ultimax Pro