The English ProTecTOR PAD is a single unit with the protective shields built in. This Pad includes an 1/8" thick WOOL LINER PAD that is removable. IT ELIMINATES HAVING TO WASH THE PROTECTOR PAD. The LINER PAD IS CUT EXACTLY THE SAME AS THE PROTECTOR ABOVE IT. The ProTecTOR is made with an 1/8" layer of black felt on top and under the slotted Protective shields that are molded of: 1/10th inch of Aircraft Plastic. The Pad is thin enough to allow use of a quilted riding cloth over it for showing if you like. This Pad is 26" long and works with 16.5" to 18.5" saddles. Four front & 4 rear 1/4" Balance shims are used to adjust rider's balance, let the horse round its back more easily, or correct the onesidedness of a horse. They eliminate the need for re-stuffing which many riders don't realize is only capable of re-balancing the rider. The English Protector Pad is a Patented system that eliminates most of the Problems of SADDLE-FITTING that are never ending with a saddle alone. Width & Angle are the main problems you have left to deal with. Check with Len Brown about the impossible efforts to make trees wide enough to solve any saddling problems.