The Global Recycle Standard (GRS) is a certification that verifies the volume of recycled material in a final product. As a minimum requirement, products must contain at least 20% recycled materials based on the ISO 14021:2016 definition of Recycled Content. The GRS aims to increase use of recycled materials through accurate labeling and tracking. Its requirements include standards in five areas: recycled materials; supply chain; working conditions; environment (energy and water use, air and water pollution, waste); and chemical use for each production stage. The GRS is one of the group of certifications by the global NGO Textile Exchange, also including the Organic Content Standard (OCS) and the Responsible Wool Standard (RWS).(1-3)