Sorry for the Dutch website, might find similar once on amazon, but I got this brace from the surgeon in hospital after a week in a cast because of an avulsion fracture + torn ligaments. Turned out I needed 3 more weeks of ‘flexible cast’ (great stuff!), but the brace was simple and according tot the doctor a really good one. They literally had them to reduce the amount of ankles being taped up after such trauma.
https://m.podobrace.nl/shop/product...MIifrjtaPC3QIVg_dRCh3VRgtEEAQYDCABEgLd5fD_BwE
https://m.podobrace.nl/shop/product...MIifrjtaPC3QIVg_dRCh3VRgtEEAQYDCABEgLd5fD_BwE