COMPOSITION OUTER SHELL 89% cotton 11% metallised fibre LINING 100% polyester Which has at least: OUTER SHELL 89% OCS certified organically grown cotton CERTIFIED MATERIALS OCS CERTIFIED ORGANICALLY GROWN COTTON This fiber is produced without using artificial fertilizers or pesticides and is grown from seeds that have not been genetically modified. We are currently working with the Organic Content Standard (OCS) that supervises the process from the source to the end product.