Our racing saddles are designed to not interfere with a running horse and to be as lightweight as possible (including the stirrup irons). Racing saddles have a very long seat without a dip, combined with extremely forward flaps that accommodate the very short stirrups and extreme forward seat used by jockeys. They also have flat pommels and cantles so nothing interferes with the rider.
Our polo saddle is designed specifically for the mounted game. It has a relatively flat seat and the saddle flaps are long and fairly straight to accommodate the longer leg position, although more forward than the dressage saddle.
One of the defining features of the polo saddle is that there is very little or no padding under the leg, allowing the rider to have maximum freedom of movement. If the saddle had thigh or calf blocks, the leg would not be allowed to swing forward or back as needed.