20% net profits from your blue Bangs are invested with our partner, Drop in the Bucket (DITB). DITB recognizes water as a basic human right necessary for education and personal and social development. DITB sets up wells and sanitation systems in schools in Africa giving children in rural areas access to clean water. BANGS are made of a canvas upper, rubber outsole, and a canvas interior. BANGS run about a half-size big. Depending on whether or not you wear big socks, we recommend ordering a half-size down from your normal size.