The Ultra CTS brace has an upper piece that snaps into a low-profile activity brace. When recovering from an acute ankle injury, more stability and support is needed which is why the upper cuff is on the brace. Once more mobility is needed, you can detach the PerformaFit cuff section. By having the PerformaFit upper cuff you’re able to essentially get two ankle braces in one, giving you one brace throughout the entire course of your treatment.