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

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