Mine are a mary-jane style with double straps. The only thing is that they have a bit of a high wedge heel. Only about 1.5- 2", so not too bad for me, but some people might have an issue.
Just re-counted....I have 7 pairs of the "professional" that is a closed back that is made so your heel comes out when you walk, and 3 pairs of sandels, one closed toe and two open.