The AS1 Pro Features: -Non-stretch vertical straps that imitate the effects of the heel lock technique used in taping an ankle. -The nylon shell is lined with neoprene for the highest level of comfort and durability. -Pro Fit heel and forefoot cut for better fit and function. The circumferential strap stabilizes the brace, preventing unwanted slippage. Speed lacing eyelets for fast application, greater comfort, and reduction of pressure points. Non slip silicon printing on sole to keep straps in place.