The Edge - Correct Motion Figure Skating InsolesScientifically proven: Provides a linear knee for more stability and more power. PUSH THE LIMITS: Balancing on one foot requires transferring the centre of gravity over the foot, resulting in a shift of the hip to the side and an angled knee. The Edge lightweight archless insoles allows balancing on one foot without mis aligning the knee and hip. The result is a linear movement, which generates more power when pushing off.