Noun
saddle pad (plural saddle pads)
A pad placed under a saddle on a horse, like a saddle blanket but thicker.
Colored trim on the white saddle pad is permitted. citation A dressage saddle is required in FEI classes, although any simple English-type saddle may be used at the lower levels. Source: Internet
The saddle is usually placed over a square, white saddle pad. Source: Internet