Guardian Ultra Ankle 188. Ultra performance, ultra comfort and ultra protection. The ultra Ankle is a professional quality hinged ankle brace designed to treat all ankle injuries including high ankle sprains. Engineered to reduce excessive inversion, eversion and rotation that cause most ankle injuries. Those features include the patented LDC (Lock Down Cuff) technology with a pivoting posterior cuff that helps reduce excessive rotary forces. The thermal responsive model pad system provides optimum comfort and fit. The adjustable quick-fit Lock Down Strap allows for quick application and removal.