Disclosed are methods and apparatus of semi-custom ankle brace systems adapted to be heat-formed onto a patient's foot. The system laces around the lower calf, ankle, heel, and arch, and also provides compression and assists the unitary ankle support in preventing pronation, suppination, and plantarflexion. The boot is custom heat-molded to the end user by heating it to about one-hundred-eighty degrees and then applying it to the patient's foot while it cools. The system comprises a unitary, heat-moldable ankle and full arch support encased in soft inner and outer linings. The inner lining, outer lining, and unitary ankle support form a toeless boot with minimum bulk.