Madness has a strict code of conduct they use to screen facilities before working with them. Based on this code they work with manufacturing facilities in India and Turkey. They select their suppliers based on their third party audits, specifically all of them being audited by Fair Wear Foundation and GOTS, which guarantees ethical practices and living wages. They also maintain long term relationships with all their facilities, having worked with the one in India since 2010.
They imply sourcing their materials from their manufacturing countries, however this cannot be verified or looked into because details are not provided.