In collaboration with UNAIDS, these socks provide 7 days of HIV/AIDS therapy, preventing transmission from mother to child. UNAIDS works to ensure healthy lives and promote well-being for all ages in over 100 countries. They support the strategies and tools that prevent new HIV infections, and making sure that everyone has access to the information and HIV services they need.Comes in size USA Men's 4-8, USA Women's 5-9 (Small). The socks are made of 75% Organic Cotton, 23% Polyamide, 2% Spandex and have a seamless toe. Machine wash warm and lay flat to dry.