Dayco was the first to develop the raw edge sidewall construction V-belt which facilitated controlled slippage around pulleys.

Top Cog® V-belts
Raw edge construction is combined with the Dayco patented cogged top design to ensure the top performance that today’s vehicles and drivers demand. The Dayco Top Cog® V-belt delivers more flexibility and increases airflow around the belt so it runs cooler and lasts longer than competitors' V-belts. Three plies of neoprene impregnated fabric resist heat oil and grease and a specially formulated treatment of the polyester cord provides strength stability and reliability.