Zamst A1 Ankle Guard Ankle Brace Zamst A1 Ankle Guard Ankle Brace has been designed to restrict inversion and provide lateral stability. It has two removable inner stays, one stirrup strap and one lateral strap to enhance the stability of the ankle. Comfortable and easy to use, it is the ideal product for volleyball and tennis. Indications The Zamst A1 Ankle Guard is indicated for moderate to severe inversion or eversion sprains. High ankle sprains. Subtalar joint instability. Goals Maximum ankle stability. Prevent ankle sprains/strains. Decrease anti-inflammatory medications. Decrease ankle pain symptoms. Improve ankle joint function. Maintain flexibility.