Dayco top cog V-belts deliver more flexibility and increased airflow around the accessory drive belt, so they run cooler and last longer than most competitive belts. Dayco was one of the first to develop raw edge sidewall construction, which facilitates controlled slippage around pulleys. This feature, combined with Dayco's patented cogged top design, ensures the superior performance that drivers demand from their vehicle. The V-belts' three plies of neoprene-impregnated fabric resist heat, oil, and grease. A specially formulated treatment of the polyester cord provides the strength, stability, and reliability that's required within the standards of today's industry.