The Equalizer Saddle Pad is a major breakthrough in how to greatly reduce saddle pressure. The top is tough perforated neoprene and the underside is a l/2" layer of wool felt, and in-between is sandwiched a layer of durable flexible plastic, also perforated for ventilation. What this sheeting does -- on either side, leaving the spine clear -- is lateralize any pressure point of a saddle. It spreads out the bearing force in that area. The pad can work in as much as it will greatly decrease the chances of the horse developing a sore back. It is scalloped out over the wither, and built with a dip to imitate the top line of most horses.