ASO is a patented ankle support that can be worn either preventively or during the treatment of an acute ankle sprain. Support is achieved through non-stretch nylon straps and a stirrup technique locking the heel in place. The patented "figure 8" straps and elastic cuff support the ankle in a biomechanically neutral position, reducing either inversion or eversion type of injuries or re-injuries. Hand-wash only -small amount of gentle detergent, air dry. Made for either the left or right ankle.