Stahls’ Thermo-FILM is the world’s most popular numbering material. How to Add Names and Numbers to Sports Jerseysĭid you know you can add a name and number to a sports jersey in as fast as six seconds? If you’ve ever thought about printing sports jerseys, all you need is a heat press. Do you want to see how to add names and numbers to sports jerseys? Add a name and number to a hockey jersey in just seconds with Stahls’ CAD-CUT ThermoFILM.