Food safe fabric that is water resistant and can be used for direct food contact. No phthalates, no lead, no BPA, no other heavy metals etc. Fabric needs to be able to be machine washed and dried. The fabric can be nylon, cotton, rPET etc...as long as it is coated/laminted with a food safe PU/Acrylic etc. FDA compliant for direct food contact. Oeko-Tex certification is also very good.