The right size depends, among other things, on the size of the horse and the saddle, as well as the type of saddle. First and foremost, you should ask yourself what kind of saddle you have and then look for dressage saddle pads or jumping saddle pads. The difference lies in the cut of the two shapes. Dressage saddle pads are much longer and straighter, whereas jumping saddle pads are shorter and curved to fit the shape of the saddle. The second point to bear in mind is what kind of horse you are dealing with. Large horses always wear the large sizes, known as " DL " or " VS ". If it is a pony, the pony size may well be necessary, although many ponies can also wear the large sizes. The best thing to do here is to try them out.