Ossur Foot-up Brace Size Chart

Measure at narrowest part of leg above ankle bone.
 
 Size Inches CM
Medium 7.0" to 8.25" 17.8 to 21.0cm
Large 8.5" to 10.25" 21.6 to 26.0cm
Extra Large 10.5" to 13.0" 26.7 to 33.0cm