A Treeless saddle is a saddle without a solid traditional tree (usually made of fiberglass). The main benefit of treeless saddles are that they can adapt more to the horses gaits and movements rather than a solid tree saddle. Most endurance saddles are treeless and there is a good reason behind this, endurance horses wear there saddles for hours and hours and this would be much more difficult to accomplished without pressure points and sore spots if the saddle had a solid tree. Riders with horses that have extremely high/low wither or are swaybacked tend to like treeless saddles as they are more easily fitted and you don't need to get them refitted regularly. However each horse is different which is why we offer a 14 days free trial on all of our treeless saddles, buy now, test it and return if not suitable.