The Sport-Stirrup is designed to help prevent ankle injuries. The Sport-Stirrup is based on the Air-Stirrup Ankle Brace but has a narrower design for less bulk in a sneaker or shoe. The Sport-Stirrup has anatomically designed shells that prevent inversion/eversion. Each shell is lined with the patented Duplex aircell system. This exclusive system incorporates two pre-inflated overlapping aircells distal and proximal that provide support and protection during ambulation. Features: Semi-rigid anatomically designed shells prevent inversion/eversion Patented Duplex aircell system for support and protection Pre-Inflated aircells for easy application For Prophylactic protection.