The Organic Content Standard (OCS), a voluntary standard developed by Textile Exchange, identifies products containing natural fibres from organic cultivation, such as cotton or linen, in quantities ranging from 5% to 94%. Different from conventional agriculture, certified organic cultivation does not use synthetic chemical pesticides or fertilisers.

Products with the Organic Blended seal contain a blend of organically and conventionally grown natural fibres. This seal is used to identify products containing at least 40% or 50% certified organic materials. Only the proportion of natural fibres from organic cultivation is documented and verified by independent, accredited testing agencies along the supply chain. The certificate refers exclusively to the fibre content of the product.