Abstract: A unitary boot-type ankle brace is provided having the capability of stabilizing an ankle against inversion and eversion without limiting normal plantarflexion and dorsiflexion of the ankle and while simultaneously providing focal compression of the anterior talofibular ligament. The brace is preferably constructed of a flexible material and includes a medial side portion dimensioned and configured to extend along a medial side of a user's leg and foot, and having a lateral side portion dimensioned and configured to extend along a lateral side of the leg and foot. The side portions are joined to a forwardly extending forefoot sleeve portion and to a base portion. In a primary aspect of the invention the side portions define a rear opening for insertion of the foot with a strap for selectively connecting the side portions adjacent the user's heel.