Thuasne Ligastrap Malleo Ankle Brace support a sprained or swollen ankle, Thuasne have combined their best-selling Malleo Dynastab with the Boa closure system to create the most comprehensive ankle brace around. No more awkwardly yanking laces, or retying loose straps, with Boa technology you just twist to tighten and push to release. Boa laces distribute pressure efficiently and evenly.�Size 1�ankle circumference is 7�1/2�- 8�3/4 inches.