An ankle brace comprises (a) a boot assembly comprising a semi-rigid or rigid support, (b) an adjustable stirrup configured to go under the arch of a wearer's foot, the adjustable strap being located at least partially within the boot assembly, (c) a first lace threaded through each end of the adjustable stirrup, and (d) a first rotatable tightening mechanism configured to apply tension on the lace thereby tightening the adjustable stirrup and pulling it upward.
