Ankle injuries fall into the tibia/fibula class of injuries. Sometimes referred to as half casts, some ankle splint brands cover through the entire bottom of your foot or just the base of your heel. The primary off-the-shelf orthopedic splints are boot-like apparel that immobilizes your ankle and stabilizes your foot. But the posterior AFO leaf splint fits more like a sock. Regardless, you can put on the other splints like a shoe and tighten the Velcro straps from the bottom up. Also, it would help if you chose the correct fit for your foot and ankle.