How to choose the right pointe shoes
The rigidity of soles should be suited to the strength of your ankles.
The sole should be:
Neither too supple: when on point, your feet should not go too far forward,
Nor too rigid: when you are on pointe and the sole does not stay in contact with your instep, you won't be able to correctly bend your foot, and so won't be able to dance on pointe.