Back on Tracks Therapeutic Western Saddle Pad Liner is perfect for the western rider who wants to keep their horse’s back muscles loose and relaxed. Whether you are training or competing, the Western Saddle Liner is particularly suitable for horses with sensitive backs helping to improve overall flexibility, resiliency to injury and improved overall agility of the muscles. This saddle liner should be used under your regular saddle pad on horses with cold or sore backs. One Size - Black Only. Saddle pad measures 31" spine x 16" drop.