Is the lining leather? Synthetic linings cause sweating, blisters and do not mould around the foot.
Has the upper been stitched to the lining? Avoid wearing shoes that have been glued as they will split easily .
Is there arch support inside the shoe and double padding under the ball of the foot?
Does the heel height allow you to walk without “rolling” your ankles? If you can’t walk in the shoe do not expect to dance in it!