Flex foil is used for decorating textile (cotton, polyester, or a cotton-polyester blend). The Hotfix foil packages at Vaessen Creative consist of 1 sheet of glitter silver transfer foil in A4 size. With the transfer foil (also known as textile foil, flex foil, or iron-on foil) you can apply your own design to your textile and clothing. You apply the foil with the help of an iron. The advice temperature is 160 degrees Celsius. Press down your iron onto the foil with an even pressure for about 20 seconds. Let the foil cool well before you peel off the protective layer. It is a cold peel transfer foil.