Home / Journal / Guide
Guide

Flock, Flex and Heat Transfer: How Names and Numbers Were Printed

November 2026 · 6 min read

The names and numbers on a football shirt were not always printed the same way. Knowing the main methods helps you date a shirt, spot a later addition and judge condition.

Flock

Flock has a soft, slightly velvety surface made from short fibres bonded to a backing. It was common for names and numbers in earlier decades. Over time it can crack, shed and curl at the edges, and heat can leave marks around it. Cracking is normal ageing, but very fresh flock on a very old shirt deserves a closer look.

Flex and vinyl

Flex is a smooth, slightly shiny plastic film cut into letters and numbers and pressed onto the fabric. It became widespread later. Look at the edges: they should be clean and consistent, and the film should sit flat. Peeling, bubbling and yellowing are signs of age; a very sharp, perfectly flat print on a shirt that is otherwise worn may mean it was applied later.

Heat transfer and sublimation

Modern shirts often use heat transfer or sublimation for badges, sponsors and numbers. These can be very thin and lightweight, and on some shirts the print is built into the fabric rather than sitting on top.

Competition and league printing

Leagues and competitions use their own official fonts and sets, and these can change from one season to the next. A name and number set in the wrong font for the competition and season is a warning sign. Collectors keep reference photos of each competition's sets for this reason.

What to check

Related reading

Printing is one point among several. Our guide to spotting fakes and our photo-matching guide show how the details fit together. To see printed names and numbers up close, browse the match worn and issued shirts.

Browse the collectionLooking for something specific?
← How to Read a Football Shirt Label: Tags, Product Codes and DatesHow to Buy Vintage Football Shirts Online Safely →