An external orthotic device increases comfort, stability, and motion control of the ankle and/or foot. An outer shell comprises separate medial and lateral portions, attached to each other only by a flexible/hinge connector that extends between and is preferably anchored to each of the portions in an under-the-foot region of the shell. This connector retains the bottom end of the shell portions together, but allows the shell portions to pivot or otherwise move relative to each other with the bottom-of-the-foot connector as the pivot axis. This pivoting allows the shell to open wide for donning and doffing of the orthotic device and for adjusting the closeness of the two portions to tighten the two portions on the wearer. Strap(s) or other retainer may tighten the medial and lateral portions together around a liner into which the wearer inserts his/her foot.
