foils are plastic films manufactured to be shiny, resembling metallic leaf when applied to cloth. They are perfect for a bit of shine and high textural contrast. In order for foils to be permanent on cloth they must be applied to a permanent, water based adhesive, and heat must be used for the application, as opposed to rubbing or burnishing. Foils are surprisingly sturdy and if properly cared for, will withstand use on clothing and home furnishings. See Supplies for a wonderful source for foiling materials.