Great looking shoe, but the design of the back heel allows distortion from the ankle strap pulling forward. The shoe looks great, great color, great style, but the ankle strap is not adjustable. Instead of a buckle, it has elastic. This means that, except for the perfect leg that is precisely the size of the ankle strap, either the strap will be loose and sag, or the strap will be tight, and pull on the back.

If the strap is too tight, it pulls the top of the heel forward, causing an unsightly buckling of the bottom part of the back of the shoe.

I expect, due to the softness of the back and the shape that the material would bend even if the strap was adjustable. The back of the shoe is just not stiff enough to resist bending.