Apolla Shocks are the ONLY dance footwear awarded the American Podiatric Medical Association Seal of Acceptance. The patented highly-engineered knit design creates durable footwear that lasts. A favorite crew-length style that's versatile for class, stage, or convention; Maintains a continuous line of the leg for a seamless look; Allows freedom to spread toes; Reduced compression at the opening does not indent the skin; Knit-in energy absorption pads in the ball of the foot and heel; No compression in the toes, but does have a slim cut and snug fit; Moisture-wicking and antimicrobial; Washable; DO NOT use fabric softener or dryer sheets; Made in USA; Apolla Shocks are anatomically correct. The slope of the big toe tells if it is "Left" or "Right." Please Note: The Performance's non-traction design is best suited for carpeted surfaces and can easily be added to any dance shoe.