All I know about PolyTrack is that my two horses (one now because Picnic Vickee got claimed) loved training on the PolyTrack surface. They came back in great shape. No soreness or swelling in the ankles. People seem to think that soreness or swelling only happens to unsounds horses. This isnt true....granted more low level claiming horses have some sort of injury but not all of them do. Polytrack is good for winter tracks or tracks that get tons of rain.