An artificial turf fiber comprising a polymer material and an anti-slip agent disposed within the polymer, characterized in that the anti-slip agent has an effective rate of migration in the polymer material and is provided in the polymer material in an effective amount to provide effective reduction of the fiber friction coefficient on the surface of the fiber for at least one year, preferably for at least 2 years, more preferably for at least 5 years, and most preferably for at least 10 years.