I do not recommend using a bareback pad with stirrups. The pad can slip to one side or the other and, with your feet in stirrups, you can go with it and get hurt. There are some "bareback saddles" that have enough structure to stay put in the withers, but this one doesn't appear to be one if those.
I will say that, as a person who rides with a stirrup less pad all the time, you can train a horse with a pad. I have once. I prefer to ride stirrup less and have years of practice.
But the reason most people use a saddle is they get a more secure seat. And even though I prefer to ride on a pad, I still use a saddle occasionally for trail and overnight rides.
What is your plan for the horse? Why are you buying a pad to train a horse?
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