Hot fix crystals are come with a special backing that allows them to be fixed to your chosen surface when they are heated. This means they can be used on a wide range of surfaces including fabric. The best way to activate the backing is with an iron for fabrics or a heat gun for card and paper. When ironing the crystals use a tea towel or similar between the iron and the crystals. Use them to add decoration to clothing, pencil cases, fabric shopping bags etc. Do not use on any material that is likely to melt.