The Ultimate Performance Dressage Pad! Ultra ThinLine sewn on top of the highest quality cotton with medical grade sheepskin under the panels and at the front roll. Underneath the Ultra ThinLine layer is a pocket for shims (sold separately). This is one of the finest ThinLine products we have produced. Measures 23" long along the spine (21" not counting the front roll) and 21.5" in flap length.