Traces are what attach the horse to the vehicle. They are buckled into the end of the breastplate and attached at the other end to the carriage tree. Note that separate traces are not required when using SL Sportz harness, as the Sportz breastplate features integrated traces in its design.These traces are supplied in all standard and sliding backband sets of SL single, pair and team harness.The dee end allows a quick release connection to the vehicle, while the addition of the slot means that they can also be used with a regular swingle tree.25mm (1") wide to suit SL Breastplates What are traces?Traces are the straps which run from the collar or breastcollar to the vehicle and enable the horse to pull the vehicle. There are many different methods for attaching the traces to the vehicle.Dee end traces are ideal for use with snap shackles for quick release.