U-Control Insole System ™
All SpringBoost footwear comes with 2 or 3 pairs of interchangeable insoles, depending on the model. Each pair of insoles provides a different degree of dorsiflexion ranging from 0° to 5°. 
The lower degrees of dorsiflexion (0° and 1°) are designed for the user to progressively adapt to this position. SpringBoost is the only athletic footwear built with the heel lower than the ball of the foot, so it requires a short adaptation period!
The higher degrees (2° to 5°) intensify the training effects; enhance muscle fiber recruitment, improve explosive power and energy efficiency.
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