Assertion: stirrup | /r/HasProperty | effective
Facets:
Source sentences:
text: The treed saddle was necessary before stirrups that had significant weight-bearing use could be effective; stirrups without a treed saddle will create pressure points that injure the horse's back if they carry a lot of weight (as recent studies of "treeless" saddles, racing saddles and bareback pads with stirrups have demonstrated).