Soft law instruments such as declarations, guidelines, directives, and codes of conduct significantly influence international human rights law. This chapter examines their functions, effects, and the interaction between soft law and customary or conventional norms. It discusses how soft law instruments contribute to the development and implementation of human rights norms, providing flexibility and adaptability. The chapter also explores the challenges and limitations of soft law, including issues of enforceability, legitimacy, and consistency. It highlights the role of soft law in complementing and reinforcing customary and conventional human rights norms, and the need for a comprehensive approach to integrate soft law into the human rights framework.