From their website:
SureStep is the most effective means of providing stability to children who pronate when standing and walking. This patented, dynamic system allows children to gain stability, while still allowing normal movement and function. Children with low muscle tone who have trouble with stability due to pronation can now walk, run and jump without the delays and instabilities that often result. SureStep is not a different brace, but rather a completely unique system that manages the foot and ankle without over-managing.