Repetto Zizi jazz or ballet dance shoes. Repetto makes ballet shoes for the Paris Opera and many other ballet companies, and it's obvious from the quality. These shoes are very light and flexible!
The heel is a bit squished, but it's not actually uncomfortable when worn because the entire shoe is made of very soft leather. When your foot is in it it looks much less squished. Since they're leather, they're very durable.
Size 37FR - fits a size 6US