Yes, a race number can be attached to all SPIbelts, but you will need to purchase a set of Race Bib Toggles that loop around the elastic of your SPIbelt. SPIbelt Endurance Series comes with built in Race Bib Toggles.
How to use:
-Squeeze plastic toggle and remove black cord.
- Loop one end of cord around belt.
- Insert one end of cord through hole on bib.
- Squeeze toggle and insert both ends of cord into toggle hole.
- Repeat on the other side.