The Aircast Air-Stirrup Universe Ankle Support Brace is designed with semi-rigid shells lined with the Duplex aircell technology system which enhances circulation and reduces swelling. The compression promotes efficient edema reduction in addition to helping accelerate rehabilitation. Anatomically designed for acute ankle injury, post-operative use, chronic instability and ankle sprains grade I, II, and III. The Aircast Air-Stirrup Universe Ankle Support Brace resists inversion more than taping, yet normal flexion is virtually unrestricted. Built for ankle stability, the contoured shells conform closely to the ankle so there is minimal bulk in your shoe. The Duplex aircell is pre-inflated and the adjustable heel pad allows for a comfortable fit. The Universal fit allows the Aircast Air-Stirrup Universe Ankle Support Brace to be worn on either the left or right foot.