15" RL Watson flex panel saddle, endurance / distance runner model. Very good condition, only blemish is some wear on the blevins buckle strap, but it is not worn thru or even close to. It is 100% useable as is. Super padded comfortable seat, like a recliner! These saddles are hard to find and are much better quality than any other flex panel. There is not a specific gullet size because they have panels bolted to the seat that flex with the horse's movement. This is different than a flex tree saddle! These saddle fit virtually every horse because of the panels that flex. These are perfect for long distance rides, and no special saddle pads are needed.