Mimi the Sardine range is made from Swedish cotton prints that have been treated with an environmentally sound coating to make them permanently water and soil resistant. Just wipe and wear or machine wash as needed. They are produced in accordance with strict environmental laws and are certified; the coating is made from acrylic and not PVC.They use no chlorine in the production process, and only water soluble dyes. The Oeko-tex 100 standard is an ecological certification. It is a declaration to consumers that the cloth does not contain chemicals and components harmful to their health.