Air takes contours of ankle, allow easy customization of pressure & compression. Provides effectuve & high degree of immobilization along with good cushion to enhance user comfort. No compression hot spot on the ankle, reduces sport related injuries and provides quick healing with better recovery. Easy to use, light weight, pleasing aesthetics, sleek design, skin friendly. Can be used for either leg with universal size fits all. For correct size please measure circumference approx 2 inches above the inner ankle joint and refer corresponding size in size chart.