Robyn is a perforated ballet flat that features Vionic's Vio-Motion Technology to keep your feet supported and comfortable. Vio-Motion Support is an innovative approach to foot health: Vionic conceals biomechanical technology into each shoe. All-day comfort is a difference you can feel. Deep heel cup provides essential stability. Stylish and comfortable footwear that incorporates a podiatrist designed biomechanical footbed.