With dance shoes, fit, heel, and fastening matter
Flamenco shoes are working tools for repeated contact with the floor. Many models have nails at the toe and heel that help shape the sound. But a loud shoe is not necessarily the right shoe. Your foot needs to be supported without painfully squeezing your toes or instep. Your heel should not slip out noticeably when you lift your foot, while you still need room to place your toes naturally.
A wide heel firmly attached to the shoe provides a different base than a narrow fashion heel. The height changes how your weight is distributed and should let you stand with control. There is no one ideal height. Straps, buckles, laces, or elastic inserts need to suit your instep: extra fastening does little if the whole shoe is too loose.
Assess sound and fit separately. Different floors significantly change volume and tone. A muffled sound therefore does not prove a material defect, while a bothersome rattle may come from a loose component. Visibly loose nails or a wobbly heel are deal-breakers. The page on Flamenco technique, stance, and footwork explains how the body produces individual beats. The shoe supports this work, but does not do it for you.

