This technologically advanced design allows grooves in the gel to act like tiny springs, absorbing the stress of impact on the high pressure points in the heel and the ball of the foot. Massaging Arch Gel Insoles have the proprietary Massaging Wave System which is a technological advancement in Shock Absorption and Cushioning Comfort. This works by the gel first collapsing to absorb the shock, then it springs back, providing energy return with each step