The invention of the good saddle tree also allowed growth from the true stirrup as it is thought today.[fifteen] And not using a good tree, the rider's fat inside the stirrups produces abnormal stress points and will make the horse's back again sore. Thermography experiments on "treeless" and flexible tree https://buyfedralprimers19528.signalwiki.com/1714604/5_simple_statements_about_horse_saddle_pad_explained