Ankle Support These are recommended for foot fatigue or protecting the ankle after a sprain. Medium 8"-11" Large 10"-13" XLarge 12"-16" How to choose the right size. The support should not be worn too tight. It should fit so that it does not fall off and so that it does not bother you when you wear it for a long time for while sleeping. You can wear the ankle support like the picture to protect the heel. by KYOWA TEXTILE USA INC. For additional information please E-Mail to info@kyowa-textile.com