I find closed ballet flats too stuffy now that my feet are a-l-w-a-y-s hot, so I have started wearing these thong sandals. They are really comfortable because of those cushioned circle designs.
I got these from the same store in Lajpat Nagar Market - Stelatoes - for around Rs.795. The same time I got the grey pair shown here. If I remember correctly, they were available in other colors as well.