Yes, they do look like undies, we agree ;) 

footUndeez™ create the illusion of dancing barefoot. Its four way stretch spandex material is both breathable and stable thanks to the sewn in fore foot pads. The one-sided, Capezio logo elastic holds footUndeez™ in place during every pirouette. Recommended for lyrical and modern classes.

Product Features:

• • 4 way stretch, breathable Nylon and Lycra Spandex powernet upper
  • Patented ExoArmor duet sole patches move independently
  • Fore foot pads are securely sewn with stitching both on the edge and interior
  • 5/8" one-sided plush elastic with Capezio logo holds footUndeez in place
  • Women begin with street shoe size. Men begin 2 sizes up from street shoe size. 1/2 sizes are encouraged to size up to the next full size.
  • P (4-5), S (6-7), M (8-9), L (10-11), XL (12-13), XXL (14-15)

Also available in child sizes