An ankle brace provides a variety of features that contribute to comfort, stability, and support. One embodiment provides thin, elongated gripping surfaces on the bottom of the brace, to reduce the opportunity for the brace to slip relative to the wearer's shoe. One embodiment provides substantially horizontal strap-receiving slots in the forefoot area, which; pull the foot down, toward the bottom of the brace, not relying on the shoe to hold the foot down against the brace.